How to Pack Carry-On Luggage for a Week | One Bag, Seven Days

Packing for a week in one carry-on seems impossible until you stop packing outfits and start packing a system. The whole approach comes down to three constraints: the bag must meet your airline’s size limits, every liquid must fit in one quart-size bag under TSA rules, and every clothing item has to do double duty. Once those three pieces are locked in, seven days in a carry-on is genuinely routine — even on a budget airline.

This guide covers the dimension rules that actually apply, the clothing counts that work, and the mistakes that send travelers to the gate with an oversize bag. If you’re shopping for a bag before you pack, our roundup of the best cabin suitcase under $50 tested against major US airline limits is worth a look.

Carry-On Size Limits That Apply in the US

TSA does not set carry-on dimensions — your airline does. The Transportation Security Administration only screens what you bring; the size restriction comes from the carrier operating your flight.

For most US domestic flights, the standard carry-on maximum is 22 x 14 x 9 inches, including handles and wheels. American Airlines, for example, caps bags at exactly that size. But limits vary by carrier — some regional jets and budget airlines accept smaller bags, and a few allow slightly larger ones. Always check your specific airline’s page before you leave.

Two measurement mistakes cause most gate-check surprises:

• Measuring only the shell of the bag. Airline limits include handles and wheels, so measure the full outside dimensions.
• Assuming one limit fits all airlines. A bag that sails through on one carrier can get flagged on another.

Your airline’s website is the authority for its own limits, and TSA’s own guidance confirms that size restrictions are set by the airline, not the agency.

The TSA Liquids Rule: What Fits in a Quart-Size Bag

Every liquid, gel, and aerosol you carry must be in a container of 3.4 ounces (100 milliliters) or less, and all of those containers must fit inside one quart-size bag per passenger. That single bag is the ceiling for everything — shampoo, toothpaste, sunscreen, deodorant gel, contact solution, all of it.

The most common packing failure is overpacking liquids and discovering at security that not everything fits in the one bag. A few ways to stay under the limit:

• Buy travel-size versions of everything you need; 3.4 ounces is roughly 10 days of shampoo for most people.
• Pack solid alternatives where they exist — bar soap, solid deodorant, and dry shampoo don’t count toward the liquid limit.
• Keep the quart bag on top of everything so you can pull it out fast at the checkpoint.

TSA’s liquids rule applies at security screening; if you’re checked a bag, the 3.4-ounce limit doesn’t apply to what’s inside it.

What to Pack for Seven Days

Travel guides agree on the core strategy: build outfits, not individual items. Choose a base palette where every top works with every bottom, and you stretch a small wardrobe across a full week.

A realistic week-long count looks like this:

Wear your bulkiest items during travel — the heaviest shoes, the thickest jacket, the sweater that eats half a bag. That single move frees more space than any folding technique.

Packing cubes keep the system honest: one cube for tops, one for bottoms, one for underwear and socks, plus a flat pouch for separating dirty laundry. Roll or fold, keep each cube’s contents flat, and the bag stays organized the whole trip.

Mistakes That Break the Carry-On System

Three errors undo otherwise solid packing plans, and all three are avoidable.

The first is overpacking liquids, covered above — the quart-size bag is non-negotiable. The second is measuring only the bag’s shell, which ignores the wheels and handles that count toward the limit. The third is assuming your airline’s limit matches your bag’s marketing specs; check the carrier’s current dimensions before every trip, because they do change.

For security-access items — passport, wallet, keys, medications, phone charger, headphones, eye mask — keep them in one easy-to-reach outer pocket so you’re not digging through cubes at the checkpoint. And if you don’t already own a bag that meets the common 22 x 14 x 9 limit, finding one that fits every major US airline is the single best prep step you can take.