Travel Packing Guides
How to pack a carry-on, what fits under the seat, and the airline size rules that decide it all — the reference pages our roundups link back to.
The bag is only half of one-bag travel; the other half is knowing what the airline will let you carry and how to fit a trip into it. These guides are the reference layer under our roundups — the airline size limits, the packing method, and the decisions (backpack or suitcase, cubes or compression bags, 40L or 45L) that shape which bag you should buy in the first place. Start with whatever question is stopping you, and every guide links back to the picks it supports.
The one we lean on most is the carry-on and personal-item size guide: a maintained, airline-by-airline table of the actual dimensions, cited to each airline’s own page and dated. Nearly every other roundup buries those numbers in prose or skips them; having them in one place is what lets us do honest carry-on fit math on every pack we recommend.
Everything in Guides
Carry-On & Personal-Item Size Guide
The airline-by-airline carry-on and personal-item dimensions, in one maintained table, cited to each airline's own page.
How to Pack a Carry-On
A repeatable method for fitting a week into a carry-on — what to roll, what to cube, and the order it goes in.
How to Use Packing Cubes
The system that makes cubes worth the money — assigning cubes, rolling vs folding, and compressing without wrinkling everything.
One-Bag Travel Packing List
A tested-in-principle capsule packing list for traveling a week or a month out of a single carry-on backpack.
What Size Travel Backpack Do You Need?
30L vs 40L vs 45L — how to pick a capacity by trip length and body size, and why bigger is usually the wrong answer.
Travel Backpack vs Suitcase
When a backpack beats a wheeled carry-on and when it doesn't — a decision framed on cobblestones, stairs, backs and gate agents.
Packing Cubes vs Compression Bags
Organization or raw space savings? Which one actually helps in a carry-on, and why most people should use both.
Travel Backpack vs Duffel
A duffel is softer, cheaper and squashes through sizers; a backpack carries. Which trade-off actually suits your trip.
Are Packing Cubes Worth It?
The honest answer: they buy order, not space — and here is exactly when that trade is worth a few dollars and a few ounces.
Personal Item vs Carry-On
Is a backpack a personal item or a carry-on? It depends entirely on its dimensions and your airline — here's how to tell before the gate.
The TSA Liquids Rule (3-1-1), Explained
3.4 ounces, one quart bag, one bag per passenger — what that means in practice for a carry-on toiletry kit, cited to TSA.
How to Pack for Two Weeks in a Carry-On
Fourteen days out of a 40L bag is a laundry problem, not a capacity problem. The capsule, the cube plan and the wash routine that makes it work.
Packing Cubes vs Rolling Clothes
They solve different problems, and the honest answer is that you should do both. What each technique actually buys you, measured in space and wrinkles.
How to Measure a Backpack for Carry-On
Airlines measure the widest point, including straps and bulges. Here's how to measure your pack the way the sizer will, before you're standing at the gate.
How to Fit a Travel Backpack (Torso Length)
Fit is torso length, not height and not gender. How to measure yours in two minutes, and what it means for which packs will ever be comfortable.
How to Pack Shoes in a Carry-On
Shoes are the worst-shaped thing you'll pack. Where they go, how to stop them costing you a third of the bag, and how to keep soles off your clothes.
Carry-On Weight Limits by Airline
Most US carriers publish no cabin weight limit at all; Emirates and Qantas cap Economy at 7 kg. The airline-by-airline table, and how much of it your empty pack eats.
Power Banks & Lithium Batteries on Planes
Spare batteries fly in the cabin, never in a checked bag. The watt-hour thresholds, the mAh conversion, and what it means for a real travel tech kit.
How to Pack a Travel Backpack
Where the weight sits decides how a pack carries. The load order for a clamshell and for a top-loader, and what the compression straps are genuinely for.
Europe Carry-On Packing List (10 Days)
Ten days across Europe out of one bag: the capsule that handles shoulder-season weather and cobblestones, and the budget-carrier sizer that decides your bag first.
What Not to Pack in a Carry-On
The items that get pulled at the checkpoint, the ones that are fine despite the myths, and the short list that cannot fly in either bag.
How to Clean a Travel Backpack
Never in the washing machine. How to clean a pack without wrecking its coatings, and the three habits that decide whether a bag lasts one trip or ten years.
How to Choose a Travel Backpack
The seven decisions that pick the bag for you: capacity, the opening, the harness, the laptop sleeve, weight, fabric and warranty, in the order they actually matter.
How Many Packing Cubes Do You Need?
Four, for almost every carry-on, and which sizes. The count for a week, for two weeks, for a 40L backpack and for a personal item, with the assignment that makes them work.
Travel Backpack vs Hiking Backpack
Same liters, opposite designs. Why a top-loading hiking pack is the wrong bag for airports and hotels, when it is the right one anyway, and what the hybrids give up.
Personal Item Packing List
What fits in an under-seat bag for a weekend, and what to leave behind. The list, the order it goes in, and the airline numbers the bag has to clear.
How to Pack a Suit in a Carry-On
The inside-out jacket fold, where it goes in a clamshell backpack, and the hotel-bathroom steam that fixes the rest. A suit can fly in a 40L pack without a garment bag.
How to Pack Electronics for Travel
Laptop against the back panel, batteries in the cabin, cables in one case. How to pack tech so it clears security without unpacking and survives the trip.
What Is a Clamshell Backpack?
The opening that turns a backpack into a soft suitcase — what clamshell, half-clamshell and reverse-clamshell actually mean, and when a top-loader still wins.
Are Anti-Theft Backpacks Worth It?
What makes a backpack anti-theft, which of those features do anything, and the honest answer on whether to pay for them — by destination, not by fear.
How to Lock a Backpack
How to lock zippers that were never designed to lock, what a lock actually buys you against a pickpocket, and how to secure a backpack you have to check.
Can I Bring Two Backpacks on a Plane?
Usually yes — one as the carry-on and one as the personal item. The published numbers at ten airlines, the fare types that break the rule, and the sizes that work.
Can You Check a Backpack as Luggage?
Yes, and nothing stops you — but loose straps, open mesh and an exposed harness are what belt systems eat. How to check a backpack so it arrives intact.
How Long Do Travel Backpacks Last?
What actually fails first, what every warranty on this site covers in its own words, and how to read a lifetime guarantee before you pay for one.
Is a 40L Backpack a Carry-On?
Usually yes, and the liter figure is not what decides it. The published dimensions of every 40L pack we cover, against the box eight carriers print.
How Many Liters Is a Carry-On?
The honest conversion: a 22 x 14 x 9 in allowance is about 45 liters of box, which is why a 40L pack fits and a 45L one often does not.
How Much Does a Travel Backpack Weigh?
Every published empty weight on this site in one table, from 2.2 lb to 7.5 lb - and what each one costs you against a 7 kg cabin allowance.
How Much Should You Spend on a Travel Backpack?
What the money actually buys as you move up the ladder - harness, warranty and published specs - and the point where it stops buying anything.
How to Pack Clothes in a Backpack Without Wrinkles
Why a backpack creases clothes more than a suitcase does, and the packing order that stops it - plus the one shirt trick worth the two minutes.
What Happens If Your Carry-On Is Too Big?
What actually happens at the gate, in what order, and the four things you can still do in the line before it becomes a checked bag.
Do Wheels Count in Carry-On Size?
Yes - and it is why most rolling backpacks fail a sizer their listing says they pass. Each carrier's own wording, plus every wheeled bag we cover measured against the standard box.
What Makes a Backpack TSA-Friendly?
The TSA does not approve or certify backpacks. The term means one thing - a laptop section that lies flat - and PreCheck makes it unnecessary.
Why Do Backpacks Have USB Ports?
There is no battery in the bag - the port is a pass-through you plug your own power bank into. Which, on a plane, is the smarter design.
Travel Backpack vs Regular Backpack
Six engineering differences, five of them checkable from published specs - plus the three conditions under which the bag you own is already fine.
What Is a Luggage Sleeve on a Backpack?
The trolley tunnel across the back panel, its three forms, the one scenario it is built for - and the two cases where it is fabric you paid for.
Why Does My Backpack Hurt My Shoulders?
Five causes in order of how often they are the problem, and four of them cost nothing to fix - starting with the strap order almost everyone gets backwards.
What Makes a Backpack Waterproof?
Coated fabric, sealed seams and a roll-top. A zipper is never waterproof - which is why the right answer for most trips is a dry bag inside your own pack.
How to use these guides
If you’re choosing a bag, start with what size travel backpack you need and backpack vs suitcase— they settle the two decisions that determine everything else, before you look at a single product. The full checklist, seven decisions in the order they matter, is how to choose a travel backpack.
If you’ve got the bag and need to pack it, the how-to-pack-a-carry-on method and the one-bag packing list get a week into a carry-on without a fight, and how to use packing cubes makes your organizers actually earn their keep.
If you’re worried about the gate, the carry-on size guideis the one to bookmark — check your airline’s number before you fly, because that’s the rule that actually gets enforced. Pair it with personal item vs carry-on, which explains which of the two allowances your bag actually falls under, and the TSA liquids rule for the other thing that gets a carry-on opened at screening. The short answers to the questions we get most often are collected on the FAQ.
And if you’re weighing a purchase, two guides answer the questions people ask before spending: travel backpack vs duffel settles which kind of bag your trip actually wants, and are packing cubes worth it gives the honest version of the space-saving claim before you buy a set. If the purchase is a present, the gift guides rank the same picks by budget, and the Black Friday & Cyber Monday deals hub says which of them are worth waiting for.
Why we cite and date everything
Airline baggage rules change, vary by fare and aircraft, and are enforced at the gate’s discretion. So every figure in these guides is pulled from the airline’s own page and stamped with the date we checked it. Treat them as a well-sourced starting point, and confirm the current rule for your specific flight before you rely on it.
Frequently asked questions
How big can a carry-on be?
On most US major airlines, up to 22 x 14 x 9 inches (56 x 36 x 23 cm) including wheels and handles. Southwest and Frontier allow a larger 24 x 16 x 10, and low-cost European carriers can be far stricter — Ryanair's free bag is just 40 x 20 x 25 cm. The carry-on size guide lists every airline's number.
What's the difference between a carry-on and a personal item?
The carry-on goes in the overhead bin (up to ~22 x 14 x 9 in on US majors); the personal item is smaller and fits under the seat in front of you (roughly 18 x 14 x 8 in or less, varying by airline). On most standard fares you get both; on basic-economy fares you may only get the personal item.
How do I fit a week into a carry-on?
Plan a small mix-and-match capsule, use packing cubes, wear your bulkiest items on the plane, and decant liquids into travel sizes. The method matters more than the bag — our how-to-pack-a-carry-on guide walks through the order, and the one-bag packing list gives you the capsule to start from.