Packing a Carry-On That Works for a Long Day

A carry-on is not a smaller version of your suitcase. It is the bag that has to get you through a day that might run to twenty hours, including the part where your checked luggage takes a different route than you do.

Pack it for that day, not for the holiday.

The things that should never go in the hold

Some items simply belong with you.

• Passport, tickets, cards and any medication you take regularly
• Spare glasses or contact lenses
• Chargers and a power bank, since spare lithium batteries are not allowed in checked bags
• One change of clothes, or at minimum underwear and a shirt
• Anything valuable or difficult to replace

Medication deserves an extra sentence. Keep it in its original packaging where possible, bring slightly more than the trip requires, and carry a copy of the prescription if the medicine is unusual or you are travelling somewhere with strict rules about what you can import.

Liquids, and the rule everyone half remembers

The common standard is containers of 100ml or less, all fitting inside a single transparent resealable bag of about a litre. Some airports have newer scanners and have relaxed this, others have not, and you rarely know in advance which kind you are getting.

Pack as though the old rule applies. It costs you nothing if the airport has moved on.

Baby food, breast milk and prescription liquids are usually treated as exceptions, but declare them at the checkpoint rather than hoping the scanner is generous.

Electronics and the tray

Laptops and tablets often come out of the bag at security, so pack them where you can reach them without unpacking the whole thing. A flat sleeve at the back of the bag is worth more than an extra pocket.

Cables tangle. A small pouch for cables, adapters and the power bank turns three minutes of digging into five seconds. If you are flying somewhere with different sockets, put the adapter in that pouch and not in the checked bag where it does you no good at all during a nine hour layover.

Comfort items that actually earn their space

Cabin air is dry, cabins are cold, and airports are loud. A short list handles most of it:

1. A layer you can put on and take off, ideally with pockets
2. An empty water bottle to fill after security
3. Snacks that do not smell strongly and survive being sat on
4. Earplugs or headphones, plus an eye mask for night flights
5. Lip balm and a small moisturiser, both under 100ml

Neck pillows divide people. If you sleep with one at home, bring it. If you are buying one at the airport out of hope, expect mixed results.

Weight, size and the gate check

Airlines publish cabin bag dimensions, and low-cost carriers in particular measure them. Weight limits vary widely, from about seven kilograms to twice that. Check your specific airline and fare, because the same airline often allows different things depending on the ticket you bought.

If the bag is close to the limit, wear the heavy jacket rather than packing it. And keep the essentials list above in a small bag inside the main one, so that if your carry-on gets gate-checked at the door you can lift out the important part in ten seconds.

Packing method, briefly

Rolling saves a little space and reduces creases in soft fabrics. Packing cubes do not create space but they do make it possible to find one specific thing without emptying the bag onto an airport floor.

Leave a small gap. You will buy something, or be handed something, and a bag packed to the millimetre becomes a problem on the way home.

For what happens next, see our airport security guide, which covers how to move through the checkpoint without repacking everything on the belt.