Best picks

9 Best Carry-On Bags for a 2-Week Trip (November 2026)

Updated on · By the PlentyCrate team

The best carry-on bags for two-week trips include the Amazon Essentials 21" Hardside Carry-On Luggage (best overall), the UKEIN Luggage Sets 3Piece (best matching set), and the SYCNB Extra Large Travel Duffle Bag for soft-clothes packers.

On this page (8 sections)
  1. The best carry-on bags for a two-week trip
  2. How these carry-on bags compare
  3. How we compared these bags
  4. Which carry-on size fits a two-week trip?
  5. Hard shell or soft bag for two weeks?
  6. Should a two-week carry-on have wheels?
  7. What makes a carry-on easy to pack for two weeks?
  8. Which carry-on bag should you buy?

The best carry on bag for a 2 week trip is the Amazon Essentials 21" Hardside Carry-On, because it holds about a week of clothes in 34 liters, expanding up to 25% for two weeks with a laundry stop. Pick the UKEIN set for matching luggage and a backpack, or the SYCNB duffle if your packing leans toward soft clothes and shoes.

Two weeks without a checked bag comes down to one question: how much room does the bag give you, and how well does it keep that room organized? The nine picks below answer both.

Our score weighs specs, features and buyer feedback against what you're shopping for. Read our carry on luggage guide for the size rules behind every pick here.

Our picks at a glance

  1. 1 Amazon Essentials 21" Hardside Carry-On Luggage
  2. 2 UKEIN Luggage Sets 3Piece
    Best matching set

    UKEIN Luggage Sets 3Piece

    9.6/10 our score

    See it on Amazon
  3. 3 SYCNB Extra Large Travel Duffle Bag
    Best for soft-clothes packers

    SYCNB Extra Large Travel Duffle Bag

    9.5/10 our score

    See it on Amazon
  1. 4MATEIN Carry on Backpack

    MATEIN Carry on Backpack

    Best for hands-free travel
    Check it
  2. 5Laktru Gym Bag for Men Women

    Laktru Gym Bag for Men Women

    Best for gym and travel crossover
    Check it
  3. 6LOVEVOOK Carry On Luggage 22x14x9 Airline ApprovedCheck it
  4. 7LUOCIP Large Women Travel Weekender Bag

    LUOCIP Large Women Travel Weekender Bag

    Best for organized weekend-style packing
    Check it
  5. 8LOVEVOOK Convertible Garment Bag for Travel

    LOVEVOOK Convertible Garment Bag for Travel

    Best for wrinkle-free clothes
    Check it
  6. 9seyfocnia Weekender Overnight Bag Carry On BagCheck it

The best carry-on bags for a two-week trip

The Amazon Essentials hard shell is the strongest all-round choice for most travelers. Every other bag earns its place by solving one specific need, from wrinkle-free formal wear to hands-free walking.

1

Amazon Essentials 21" Hardside Carry-On Luggage: Best overall

Amazon Essentials 21" Hardside Carry-On Luggage, carry-on bags for two-week trips
9.7/10Our score
  • Expandable by up to 25%
  • 34 L capacity
  • Four multi-directional wheels
  • Interior divider and 3 zippered pockets

A hard shell that grows when your packing list does, with an organized interior for two weeks of clothes and gear.

See it on Amazon

Pros

  • Expands for extra packing room
  • Scratch-resistant shell
  • Organized interior with divider and pockets

Cons

  • Hard shell has less give than fabric
  • Lock sold separately

Amazon Essentials suits the traveler who wants one sturdy bag for a two-week trip and doesn't want to think about it again. The 34 liter shell expands by up to 25%, so the trip out packs tight and the trip home has slack for gifts.

At 13.6 x 9.5 x 20.9 inches it fits standard overhead bins. The extra-thick ABS shell has a scratch-resistant finish that shrugs off baggage belts and taxi trunks.

Inside, a divider and three zippered pockets separate clean clothes from dirty ones and keep chargers findable.

Four multi-directional wheels and a telescoping handle make long terminal walks easier. Its trade-off against the soft bags here is give: a hard shell won't squash into a tight bin the way fabric does.

It also ships without a built-in lock.

Buy it for a dependable two-week rolling bag at a sensible price. Skip it if you need a laptop pocket or a built-in lock.

Amazon Essentials 21" Hardside Carry-On LuggageCheck it on Amazon
2

UKEIN Luggage Sets 3Piece: Best matching set

UKEIN Luggage Sets 3Piece, carry-on bags for two-week trips
9.6/10Our score
  • 20 in carry-on with 8 spinner wheels
  • 18 in travel backpack
  • Toiletry bag included
  • TSA combination lock

One purchase covers the rolling suitcase, a backpack that slides over the handle and a toiletry bag for a two-week trip.

See it on Amazon

Pros

  • Three pieces in one set
  • TSA lock and alloy zippers
  • Wet and dry separation inside

Cons

  • Heaviest rolling option here
  • Set takes up more storage at home

UKEIN is the pick when you want the whole travel kit in one order. The set pairs a 20 inch polycarbonate carry-on with an 18 inch backpack and a toiletry bag, and the backpack's back sleeve slides over the suitcase handle.

The rolling case runs 22 x 14 x 9 inches and holds 38 liters. A built-in TSA combination lock means security can inspect it without cutting the zipper.

Inside, a zippered divider and cross straps keep clothes in place, and a wet-and-dry bag handles swimwear or a damp towel.

Silent dual spinner wheels rotate 360 degrees. It's the heaviest rolling option in this group at 10.4 pounds empty, so it eats into airline weight limits more than the Amazon Essentials.

Its trade-off against the solo bags here is storage: three pieces take more closet space at home. The upside is that the matching backpack doubles as your personal item.

Buy it if you're replacing everything at once. Skip it if you only need one bag or fly airlines with strict weight caps.

UKEIN Luggage Sets 3PieceCheck it on Amazon
3

SYCNB Extra Large Travel Duffle Bag: Best for soft-clothes packers

SYCNB Extra Large Travel Duffle Bag, carry-on bags for two-week trips
9.5/10Our score
  • 55 L capacity
  • Shoe compartment for up to 3 pairs
  • Dry and wet separation
  • Luggage sleeve

A big, light duffle that swallows two weeks of casual clothes and keeps shoes away from clean laundry.

See it on Amazon

Pros

  • Very light for its size
  • Shoe compartment holds up to 3 pairs
  • Slides over a rolling suitcase handle

Cons

  • Soft sides offer less protection
  • Carried by hand or shoulder, not rolled

SYCNB suits the traveler who packs rolled clothes and wants maximum room for minimum weight. The duffle holds 55 liters and weighs just 0.73 kg, so almost all of your airline allowance goes to clothes.

At 20.86 x 10.23 x 14.56 inches it fits most overhead bins. A dedicated shoe compartment at the bottom takes up to 3 pairs and keeps them away from clean laundry.

Seven pockets, including a dry-wet section, make two weeks of gear easier to find.

The luggage sleeve slides over a rolling case handle, which helps on airport days even though the bag itself has no wheels. Polyester fabric is water resistant but soft, so fragile items need wrapping.

Its trade-off against the rolling picks is protection and effort. A full 55 liter duffle gets heavy on the shoulder after a long walk.

The Amazon Essentials rolls; this one you carry.

Buy it for casual trips where volume beats structure. Skip it for business travel or fragile gear.

SYCNB Extra Large Travel Duffle BagCheck it on Amazon
4

MATEIN Carry on Backpack: Best for hands-free travel

MATEIN Carry on Backpack, carry-on bags for two-week trips
9.4/10Our score
  • Expands to 45 L
  • Hideaway padded shoulder straps
  • Luggage strap
  • Fits a 17 inch device

A backpack that opens wide like a suitcase and rides on your back through train stations and long terminal walks.

See it on Amazon

Pros

  • Expands from carry-on size to 45 L
  • Straps hide away for briefcase carry
  • Fits a 17 inch laptop

Cons

  • Backpack carry loads your shoulders
  • Soft shell protects less than a hard case

MATEIN is for travelers who move through train stations, buses and stairs more than airport terminals. The backpack opens like a suitcase, and its expandable design reaches 45 liters when you unzip the outer section.

At 19 x 13 x 8 inches it meets standard carry-on sizing when packed to base capacity. Hideaway padded straps store in a zippered back panel, turning it into a briefcase-style carry.

A luggage strap fits over a suitcase handle, so you can roll the big case and wear this as your personal item.

The padded back panel, sternum strap and two grab handles make a full load more comfortable. A 17 inch laptop fits the device sleeve.

Water-resistant polyester and lockable zipper heads add some peace of mind.

Its trade-off against the wheeled bags is the load on your body. Two weeks of clothes in a backpack gets tiring, even with good straps.

The Amazon Essentials wins if you'd rather roll.

Buy it if hands-free movement matters more than rolling. Skip it if your back prefers wheels.

MATEIN Carry on BackpackCheck it on Amazon
5

Laktru Gym Bag for Men Women: Best for gym and travel crossover

Laktru Gym Bag for Men Women, carry-on bags for two-week trips
9.3/10Our score
  • 22 x 14 x 9 in carry-on size
  • Removable compartment dividers
  • Shoe compartment
  • Toiletry bag included

A tough duffle with dividers you can move around, so the same bag works for workouts and two-week trips.

See it on Amazon

Pros

  • Adjustable dividers split the main compartment
  • Separate shoe and toiletry storage
  • Luggage sleeve on the back

Cons

  • MOLLE webbing is a look some travelers won't want
  • No wheels

Laktru suits the traveler who wants one bag for the gym and for two-week trips. It measures 22 x 14 x 9 inches and holds 34.68 liters, sized to fit most major airline overhead bins.

What sets it apart is the two removable compartment dividers, which split the main space into two or three zones. Pack clean clothes on one side and dirty laundry on the other.

A separate shoe compartment and a toiletry bag keep the rest tidy.

The back has a sleeve for a rolling handle, and the front zip pocket holds a phone or passport. Polyester construction and a one-year warranty back it up.

MOLLE webbing lets you attach extra gear, though the tactical look isn't for everyone.

Its trade-off against the wheeled picks is effort: this is a carry-by-hand or shoulder bag with no wheels. It's also narrower in structure than the Amazon Essentials, so heavy packing gets lumpy.

Buy it for crossover gym-and-travel use. Skip it if you want a rolling bag or a plain look.

Laktru Gym Bag for Men WomenCheck it on Amazon
6

LOVEVOOK Carry On Luggage 22x14x9 Airline Approved: Best for business trips

LOVEVOOK Carry On Luggage 22x14x9 Airline Approved, carry-on bags for two-week trips
8.8/10Our score
  • 50 L capacity
  • Front laptop compartment
  • TSA combination lock
  • Two bonus packing bags

A soft rolling case with a laptop pocket up front, sized for travelers who work from the road.

See it on Amazon

Pros

  • Laptop pocket opens without unpacking
  • Includes shoe bag and 10 L clothes pouch
  • Water-resistant fabric

Cons

  • Soft shell needs more careful handling
  • Heavier than the hard-shell picks

LOVEVOOK suits the business traveler who works from the road. Its front laptop compartment opens without unpacking the main section, and a 15.6 inch laptop plus tablet fit easily.

The soft polyester shell measures 22 x 9 x 14 inches and holds 50 liters. A TSA-approved combination lock secures the main compartment, and the water-resistant, scratch-resistant fabric handles rain and taxi trunks.

Inside, a wet pocket and two bonus bags (a shoe bag and a 10 liter clothes pouch) keep packing organized.

Eight silent spinner wheels and an adjustable handle make it easy to move when fully packed. At 7.6 pounds empty it's lighter than the UKEIN set but about the same weight as or slightly lighter than the hard-shell Amazon Essentials.

Its trade-off against the hard cases is protection. Soft sides flex, so a packed laptop needs its own sleeve.

The front pocket also adds bulk that makes the case wider than some bins like.

Buy it if you carry a laptop and want quick access at security. Skip it for checked-style protection or a hard shell.

LOVEVOOK Carry On Luggage 22x14x9 Airline ApprovedCheck it on Amazon
7

LUOCIP Large Women Travel Weekender Bag: Best for organized weekend-style packing

LUOCIP Large Women Travel Weekender Bag, carry-on bags for two-week trips
8.6/10Our score
  • 40 L capacity
  • 13 pockets
  • Shoe compartment for up to 3 pairs
  • Crossbody and toiletry bags included

A duffle with pockets for everything, plus a separate crossbody bag for days out once you reach your destination.

See it on Amazon

Pros

  • Many pockets keep small items findable
  • Waterproof shoe compartment
  • Comes as a three-piece travel set

Cons

  • 40 L is tight for heavy packers
  • Soft sides and no wheels

LUOCIP is for the traveler who likes everything in its own pocket. The weekender holds 40 liters across 13 pockets, including a waterproof wet pocket and a front section with three inner pockets for small items.

It ships as a three-piece set with a crossbody bag and a toiletry bag, so you have a day bag once you reach your destination. A waterproof shoe compartment at the bottom takes up to 3 pairs and doubles as a spot for dirty clothes or wet towels.

At 20.7 x 9.3 x 14 inches and 2.2 pounds, it meets most international carry-on rules. The luggage strap fits over a rolling handle, and the padded shoulder strap detaches when you'd rather use the handles.

Four metal feet protect the base.

Its trade-off against the bigger duffles is capacity. 40 liters is tight for heavy packers over two weeks.

The SYCNB gives you 55 liters for less weight.

Buy it if pocket organization matters most. Skip it for heavy packing or longer trips.

LUOCIP Large Women Travel Weekender BagCheck it on Amazon
8

LOVEVOOK Convertible Garment Bag for Travel: Best for wrinkle-free clothes

LOVEVOOK Convertible Garment Bag for Travel, carry-on bags for two-week trips
8.3/10Our score
  • Garment bag and duffle in one
  • Shoe compartment
  • Toiletry bag included
  • Folds flat for storage

Hang a suit or dress flat, then fold the bag into a duffle for the flight and keep formal wear crease-free.

See it on Amazon

Pros

  • Hangs clothes flat to limit wrinkles
  • Folds flat for storage
  • Luggage strap and toiletry bag

Cons

  • Garment fold takes practice
  • Formal-wear layout uses space casual clothes wouldn't

LOVEVOOK's garment bag is the pick when the trip includes a wedding, a conference or a formal dinner. It hangs a suit or dress flat to keep it wrinkle-free, then folds into a duffle for the flight.

The bag offers 53 liters for 3 to 5 days of items, with one main compartment, three internal zippered pockets and two external pockets. A separate shoe compartment and a toiletry bag keep footwear away from clothes.

Water-resistant nylon with a dustproof base and ventilation holes at the bottom handles travel wear. A back zip pocket holds a phone or passport, and a luggage strap secures it to a rolling case.

The detachable shoulder strap gives you carrying options.

Its trade-off against the casual bags is the layout. Formal wear takes up space that clothes would otherwise use, and the fold takes a little practice.

The Amazon Essentials holds more everyday clothes for the same trip.

Buy it for formal wear on a two-week trip. Skip it if you only pack casual clothes.

LOVEVOOK Convertible Garment Bag for TravelCheck it on Amazon
9

seyfocnia Weekender Overnight Bag Carry On Bag: Best budget duffle

seyfocnia Weekender Overnight Bag Carry On Bag, carry-on bags for two-week trips
8.1/10Our score
  • 52 L capacity
  • Shoe pouch
  • Padded shoulder strap
  • Luggage sleeve

A roomy vintage-style duffle at a budget price, with a shoe pocket and a padded strap for longer walks.

See it on Amazon

Pros

  • Large capacity for the price tier
  • Cushioned shoulder strap
  • Waterproof PU leather look

Cons

  • Heavy empty for a soft bag
  • No wheels or structured frame

seyfocnia suits the budget-conscious traveler who still wants room. The duffle holds 52 liters in a 21.2 x 10.8 x 11.7 inch bag, enough for 3 to 4 days of clothes on its own and longer with laundry.

Waterproof super fiber PU leather gives it a vintage look that works for business or casual trips. A shoe pouch keeps footwear separate, and the padded shoulder strap makes a full load more comfortable.

A luggage slot on the back fits over a rolling handle.

At 3.3 pounds empty it's heavier than the SYCNB duffle, and with no wheels or structured frame it relies on its straps. The front zip pocket holds a phone, passport or wallet.

Its trade-off against the top picks is refinement. It lacks the dividers of the Laktru or the laptop pocket of the LOVEVOOK.

What it offers is volume at a budget price.

Buy it for a low-cost, roomy duffle. Skip it if you need wheels or a structured shell.

seyfocnia Weekender Overnight Bag Carry On BagCheck it on Amazon

How these carry-on bags compare

The table lines up the nine picks by what matters for a two-week trip: capacity, outside size, weight and the travel job each bag does best. Read it as a shortlist before you dig into the write-ups.

ProductBest forCapacitySize (L x W x H)MaterialOur score
Amazon Essentials 21" Hardside Carry-On Luggageoverall34 liters13.6 x 9.5 x 20.9 inABS hard shell9.7
UKEIN Luggage Sets 3Piecematching set38 liters22 x 14 x 9 inPolycarbonate hard shell9.6
SYCNB Extra Large Travel Duffle Bagsoft-clothes packers55 liters20.86 x 10.23 x 14.56 in9.5
MATEIN Carry on Backpackhands-free travel45 liters expanded19 x 13 x 8 in9.4
Laktru Gym Bag for Men Womengym and travel crossover34.68 liters22 x 9 x 14 inPolyester9.3
LOVEVOOK Carry On Luggage 22x14x9 Airline Approvedbusiness trips50 liters14 x 9 x 22 inPolyester soft shell8.8
LUOCIP Large Women Travel Weekender Bagorganized weekend-style packing40 liters20.7 x 9.3 x 14 in8.6
LOVEVOOK Convertible Garment Bag for Travelwrinkle-free clothes53 liters20.87 x 10.04 x 15.35 inWater-resistant nylon8.3
seyfocnia Weekender Overnight Bag Carry On Bagbudget duffle52 liters21.2 x 10.8 x 11.7 in8.1

Three patterns stand out. The hard-shell and rolling bags cluster at 34 to 50 liters with wheels and structure.

The duffles go bigger and lighter but ask you to carry them. The backpacks sit in the middle and trade shoulder load for hands-free movement.

Capacity isn't everything. A 34 liter hard case with a divider packs more tidily than a 55 liter duffle stuffed loose.

Match the layout to how you pack, not just the liter count.

How we compared these bags

We checked each bag's stated size, weight, capacity and features against what a two-week carry-on trip actually needs. That means overhead-bin fit, laundry-friendly packing space and smart compartments for shoes and toiletries.

Our score weighs those specs against what you're shopping for, so a bag that solves one job well can outrank a bigger bag with a clumsy layout. The top score goes to the bag that covers the most trips for the most travelers.

Which carry-on size fits a two-week trip?

Aim for 34 to 55 liters for two weeks if you plan one laundry stop. Under 30 liters gets cramped without daily washing.

Over 55 liters often pushes past airline carry-on limits.

Check the outside dimensions against your airline's rules, not just the liter count. The UKEIN case measures 22 x 14 x 9 inches, a common carry-on envelope.

The Amazon Essentials runs 13.6 x 9.5 x 20.9 inches, which fits standard overhead bins.

Hard cases waste less space on structure but can't squash. Soft bags flex into odd-shaped bins but need careful packing to hold their shape.

For more detail, see our guide to choosing carry-on luggage.

How many clothes fit in 34 liters?

About a week of mix-and-match clothes plus toiletries, or two weeks if you do laundry. Roll clothes and use the divider to keep clean and dirty apart.

A shoe bag or wet pocket helps with the rest.

Is 55 liters too big for a carry-on?

It can be. Soft duffles like the SYCNB reach 55 liters within a carry-on footprint because fabric flexes.

Check the stated outside size, because a full bag can bulge past the bin limit.

Hard shell or soft bag for two weeks?

Choose a hard shell for protection and a soft bag for flexibility. Hard cases like the Amazon Essentials and UKEIN shield clothes from rain and rough handling.

Soft bags like the SYCNB and Laktru squash into tight spaces and often hold more for their size.

For a trip with formal wear, a hard shell keeps creases down. For casual trips where you might need to squeeze the bag into a small overhead bin, fabric wins.

Our hardside carry on luggage picks cover the shell options in more depth.

When is a soft bag the better call?

When your packing is mostly clothes and you want to squeeze into regional aircraft bins. Soft bags also handle uneven loads better and often weigh less empty, which matters on strict weight limits.

Do hard shells scratch?

They can, but a scratch-resistant finish helps. Amazon Essentials describes its shell as scratch-resistant.

UKEIN uses polycarbonate with a texture that reduces visible scratches. Minor scuffs are normal on any hard case.

Should a two-week carry-on have wheels?

Yes for most travelers. Wheels save your shoulders and back on long airport days.

A rolling bag like the Amazon Essentials or UKEIN handles a full load without strain.

Backpacks and duffles only make sense when stairs, trains or cobblestones dominate your route.

The MATEIN backpack and SYCNB duffle both have luggage sleeves, so they ride on a rolling case as your personal item. That pairing covers both needs.

What if your route is mostly stairs and trains?

Take the MATEIN backpack. Its hideaway straps and expandable 45 liter capacity carry a week or more, and the luggage strap lets you attach it to a rolling case when the route allows.

Wear it as a briefcase when needed.

Do spinner wheels handle cobblestones?

Four multi-directional wheels roll well on smooth floors and airport tile. On cobblestones they chatter and can catch.

A backpack or a duffle with a shoulder strap is easier on old-town streets.

What makes a carry-on easy to pack for two weeks?

Compartments do more than capacity. A divider, a shoe section and a wet pocket turn a full bag into an organized one.

The Laktru's removable dividers and the LUOCIP's 13 pockets show how layout matters more than raw liters.

Look for a bag with a flat opening so you can see everything at once. Shoe compartments keep dirty soles away from clean clothes.

Wet pockets handle a damp towel or swimsuit on the way home.

Weight counts too. The SYCNB weighs 0.73 kg empty, leaving more of your airline allowance for clothes.

The UKEIN set weighs 10.4 pounds, so factor that into strict weight limits. Our lightweight carry on luggage list covers the lightest options.

Which features matter most?

A shoe compartment, a wet pocket, a divider and a luggage sleeve cover most two-week needs. A laptop pocket matters if you work on the road.

A built-in lock helps if you carry valuables.

How do you pack two weeks in one bag?

Pack about a week of clothes in mix-and-match colors. Roll instead of folding to save space.

Do one laundry stop mid-trip and use the bag's wet pocket for anything damp. Leave room for the expandable section on the way home.

Which carry-on bag should you buy?

Buy the Amazon Essentials 21" Hardside Carry-On if you want the best carry on bag for a 2 week trip and don't need extras. It covers the most trips for the most people, and its expandable shell gives you room to spare.

Choose the UKEIN set if you're replacing everything at once, the SYCNB duffle for light soft-clothes packing, or the MATEIN backpack for hands-free travel. Pick the LOVEVOOK soft case for laptop access and the garment bag for formal wear.

The rest earn their place on specific needs: Laktru for gym crossover, LUOCIP for pocket organization and seyfocnia for a roomy budget duffle. Start with capacity and wheels, then match the compartments to how you pack.

Our top 3 picks at a glance

  1. 1 Amazon Essentials 21" Hardside Carry-On Luggage
  2. 2 UKEIN Luggage Sets 3Piece
    Best matching set

    UKEIN Luggage Sets 3Piece

    9.6/10 our score

    See it on Amazon
  3. 3 SYCNB Extra Large Travel Duffle Bag
    Best for soft-clothes packers

    SYCNB Extra Large Travel Duffle Bag

    9.5/10 our score

    See it on Amazon

Frequently asked questions

What size carry-on bag works for a 2 week trip?

A carry-on in the 34 to 55 liter range covers two weeks if you pack mix-and-match clothes and do laundry once. Hard cases like the Amazon Essentials hold 34 liters and expand, while soft duffles such as the SYCNB reach 55 liters.

Can you really pack two weeks in a carry-on?

Yes, if you plan around laundry. Pack about a week of clothes, choose layers you can rewear and use packing cubes or dividers.

Bags with shoe compartments and wet pockets keep dirty items away from clean ones.

Is a backpack or a rolling bag better for a two-week trip?

A rolling bag saves your shoulders on long airport days, while a backpack like the MATEIN keeps your hands free on trains and stairs. Many travelers pair the two, using the backpack as a personal item that slides over the suitcase handle.

Do carry-on bags for two weeks need a lock?

A lock adds security for valuables, but it isn't required. The UKEIN set and the LOVEVOOK soft case include TSA combination locks.

The Amazon Essentials hard shell has no built-in lock, so add one if you want it.

How do you fit shoes and toiletries in a carry-on?

Use the bag's own compartments. The SYCNB duffle, LUOCIP weekender and Laktru bag each have a shoe section, and the UKEIN set includes a toiletry bag.

Keep liquids in a clear pouch so security checks stay quick.