What to pack in a carry-on, by trip length and season

Trahvl editorial deskUpdated September 2026Cabin limits cross-checked against airline pages on 14 September 2026
Short answer

For one to three days, pack one top per day plus one spare, two bottoms and one pair of shoes. For four to seven days, pack five tops, two or three bottoms and plan one wash. Past a week, do not add days to the list, add a laundry interval: pack five to seven days of clothing and wash every four days. The count stops scaling with the calendar after that.

Most packing lists grow with the trip. Yours should stop growing at about day seven and change shape instead. Once you can wash, the question stops being how many days you are away and starts being how often you can get to a machine.

On this page
  1. The count by trip length
  2. What the season changes
  3. Laundry resets the maths
  4. The fixed kit
  5. Packing it into the bag
  6. Questions people ask

The count by trip length

Counts assume you wear what you travel in and that you are not doing dirty work. They are a starting point, not a rule; the number to watch is the laundry interval, not the trip length.

Trip length Tops Bottoms Underwear and socks Shoes Wash plan
1 to 3 days 3 to 4 2 3 to 4 each 1 pair worn, 1 packed if you need smart shoes None
4 to 7 days 5 2 to 3 5 to 6 each 2 pairs One wash at day 4
8 to 14 days 6 3 7 each 2 pairs Wash every 4 days
15 days and over 5 to 6 3 7 each 2 pairs Wash every 3 to 4 days

The reason the top row and the bottom row are so close is that a wash cycle of four days is the practical floor for most trips. Seven sets of underwear covers four days plus a buffer, whether you are away for eight days or eight weeks. Anything beyond that is dead weight you are carrying between two laundries.

The exception that catches peopleNo laundry access at all changes the answer completely. If you are away for 12 days with no machine, no sink and no service wash, you are not packing a carry-on, you are packing a checked bag, and the honest number is 12 tops and 12 sets of underwear. Packing 5 tops for a 12 day trip with no wash is how people end up buying shirts at the destination. Decide the laundry question before you decide the bag.

What the season changes

A season does not change the number of tops. It changes the layer count, the fabric, and the space the whole load occupies. Four seasons, four different edits.

Season What you add What you change What you drop
Hot, 28 C and above One wide-brim hat, two swim items if there is water Lighter tops, and a spare top for the day you sweat through the first one Every layer. One thin long-sleeve is the whole outerwear budget
Mild, 15 to 24 C One light mid-layer Long bottoms instead of shorts, closed shoes instead of sandals Insulated jackets, gloves, a second jumper
Cold, below 10 C One insulating mid-layer, one outer layer, hat, gloves, scarf Thermal base layer, and one less bottom because you rewear trousers longer in cold weather Sandals, swimwear, thin cotton t-shirts as a base layer
Mixed or shoulder season One packable rain shell, one light mid-layer Shoes that handle wet ground, and a spare pair of socks for the wet day Bulky insulation you may not use, and a second jacket

Cold weather is the one case where the pack gets bigger rather than longer. A puffer jacket and a fleece can add 8 to 10 litres to a load, which is most of a 44 litre sizer. This is where compression bags earn their place, and where a carry-on only trip stops being realistic for a fortnight.

Layers, not garments

The layer count is what a season changes, and layers are where a bag either works or does not. A base layer, a mid-layer and a shell cover a wider range of temperatures than one heavy coat, and they pack flat. The single heaviest item in most cold-weather carry-ons is a coat that was only needed for the walk from the airport.

Laundry resets the maths

There are four realistic laundry situations, and each one gives a different number to plan around.

  1. No laundry at all. The cycle is the whole trip. Plan one top per day, and accept that past a week this is checked-bag territory.
  2. A machine once a week. The cycle is seven days. Pack seven of everything you cannot rewear, which in practice means underwear and socks, and five or six tops.
  3. A machine every two or three days. This is the most common hotel and apartment situation, and it is the one that makes a 30 day trip fit in a carry-on. Cycle of three days, so three tops plus one spare, three sets of underwear plus a buffer.
  4. Sink washing. A cycle of two days, but only for light items: underwear, socks, a t-shirt, a base layer. Heavier items do not dry overnight in a hotel room and you will be carrying damp clothes. A sink cycle does not replace a machine cycle for bottoms.

One practical detail that decides whether sink washing works: fabric. Thin synthetic and merino blends dry overnight in a bathroom. Heavy cotton does not, and a damp cotton t-shirt in a sealed bag will smell before you reach the next city. If your plan depends on sink washing, the plan depends on what the clothes are made of.

What we do not knowDrying time depends on the fabric, the garment weight, the room, the humidity and the airflow, so any blanket claim that a washed item is dry in eight hours is a claim about one bathroom on one day. Test it at home once: wash one t-shirt by hand, hang it in a bathroom, and see how long it actually takes. That single experiment is more useful than any packing guide, including this one.

The fixed kit

These items do not change with trip length or season, which is exactly why they are the ones that quietly add two kilos.

Category What goes in Sizing note
Liquids and toiletries Under 100 ml each, in one transparent resealable bag of no more than one litre Decant at home. A half-full 200 ml bottle is still a 200 ml container and will be taken at security
Electronics Phone, one charger, one cable per device, one travel adapter, one power bank Power banks go in the cabin, never in a checked bag, and some airlines limit you to two
Documents Passport, boarding passes, travel insurance, one card you can block if it is lost Keep these in the small bag that stays with you, not in the overhead locker
Medication Prescription medicine in the original labelled packaging Liquid medicine over 100 ml is allowed with proof that it is prescribed to you
Comfort Empty water bottle, eye mask, earplugs, one thin scarf The scarf doubles as a blanket, a pillow and a cover for cold flights

Toiletries are their own problem and are covered in more detail in our toiletry bag guide. The short version is that the security limit is a container limit, not a liquid limit, so buy small containers rather than half-filling big ones.

Packing it into the bag

Layer in the bag What goes there Why
Bottom, against the wheels Shoes, then compressed soft bulk Rigid items belong where the frame already stops them moving
Middle Bottoms folded flat, then tops rolled Folds stack; rolls fill the gaps between them
Top, under the opening Toiletry bag, cables, anything you need at the airport You will open the bag for these and should not have to unpack to find them

A quick reference for whether your pile will fit: a 55 x 40 x 20 cm sizer box is 44 litres, and a 22 x 14 x 9 inch box is 45.4 litres. Assume you can use about three quarters of that for clothing once shoes, the toiletry bag and the bag structure take their share. The packing list generator does that arithmetic for your trip and returns a volume and weight estimate, and the carry-on size checker has the published limits for 23 airlines if you need the number for a specific carrier.

Questions people ask

How many outfits should I pack for a 7 day trip in a carry-on?
Five tops, two to three bottoms, and one wash at day four. Seven complete outfits do not fit in a 44 litre carry-on once shoes and toiletries are in, and you will rewear bottoms anyway. The wash is what buys you the extra days, not more clothes.
What should you not pack in a carry-on?
Anything over 100 ml in a container, power banks in a checked bag, sharp objects, and items that some countries restrict on arrival such as certain foods and plant material. Bottled liquids and aerosols over the container limit are the most common reason a bag gets searched, and the rule applies to the container size, not how much is inside it.
Is it better to roll or fold clothes?
Roll the soft items you are compressing: t-shirts, knitwear, base layers. Fold flat the items that need to stay presentable: shirts, trousers, a blazer. Rolling is not inherently better than folding, it just fills irregular gaps, which matters when you are already close to the bag depth limit.
How do I pack for both hot days and cold nights?
Pack three thin layers instead of one thick one: a base layer, a mid-layer and a packable shell. Three thin layers cover a wider temperature range than a single heavy garment, they pack smaller, and you can remove them one at a time rather than choosing between too hot and too cold.
How many pairs of shoes do I need?
Two: the pair you wear and one packed pair. Shoes are the least compressible item in any bag, and each extra pair costs roughly 3 to 4 litres of volume. If the trip includes hiking or a formal dinner, plan which of the two roles your worn pair covers and pack only the other.

Sources

  1. Transportation Security Administration. Liquids, aerosols and gels rule (3-1-1) — www.tsa.gov/travel/security-screening/liquids-aerosols-gels-rule
  2. Transportation Security Administration. TSA explains the 3-1-1 liquids rule — www.tsa.gov/news/press/releases/2024/12/10/tsa-prepared-christmas-and-end-year-travel-out-philadelphia-area
  3. GOV.UK. Hand luggage restrictions at UK airports: liquids — www.gov.uk/hand-luggage-restrictions/liquids
  4. Lufthansa. Carry-on baggage rules — www.lufthansa.com/us/en/carry-on-baggage
  5. Ryanair. Ryanair bag policy, help centre — help.ryanair.com/hc/en-us/articles/12888036565521-Ryanair-s-Bag-Policy
  6. American Airlines. Carry-on bags and size limits — www.aa.com/i18n/travel-info/baggage/carry-on-baggage.jsp

The bags this list was written around

Carry-on backpacks, duffels and packing cubes with the dimensions printed, not approximated.

See the carry-on range

Which one to buy

Every option this store stocks, with price, type and who it suits, is compared on one page.

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