Carry-on only means no baggage carousel, no lost bags and no lugging a 50-pound suitcase up three flights of stairs to a rental. It also means every item has to earn its space. The trick isn't squeezing more in. It's packing less, on purpose, and doing the math before you start, not when the zipper won't close.
Quick answer: how to pack carry-on only
- Pick the bag first. Most big US airlines allow a carry-on of about 22 x 14 x 9 inches plus a personal item, but limits vary by airline and fare. Check yours.
- Plan outfits by day, then re-wear. Count tops for about one wear each and bottoms for two or three.
- Pack to your first laundry day, not to the end of the trip. Plan a laundry day halfway and you need about half the clothes.
- Wear your bulkiest shoes and layers on the plane.
- Liquids: 3.4 oz (100 ml) containers in one quart-size bag. Medication and baby formula or food are exempt.
Step 1: Pick the bag, then the list
The bag is your budget. Decide what you're carrying before you decide what goes in it.
Typical limits (check before every trip, because they change):
- United: carry-on 22 x 14 x 9 in, personal item 17 x 10 x 9 in (United).
- American: carry-on 22 x 14 x 9 in, personal item 18 x 14 x 8 in (American).
- Delta: carry-on 22 x 14 x 9 in, personal item must fit under the seat (Delta).
- European budget airlines can be much stricter. Ryanair's free bag is a small under-seat bag of 40 x 30 x 20 cm, and an overhead bag costs extra (Ryanair).
- Basic economy and budget fares may not include a full-size carry-on at all. Check your fare, not just the airline.
- Some airlines outside the US weigh carry-ons. Look up your airline's weight limit if you're flying abroad.
Leave some room. A bag packed to bursting at home is a bag that won't close after a week of re-packing in a hurry, and there's no space for anything you buy. If you're over, cut the bulkiest things first (extra shoes, a second jacket, towels, hair tools), never the small essentials like meds, documents and chargers.
Step 2: The outfit formula
Overpacking happens when you guess, and "a few extras just in case" for every day adds up fast. Plan by day instead.
- Tops: about one wear each, up to your first laundry day.
- Bottoms: one for every two or three days. Jeans and dark trousers go further.
- Underwear and socks: one per day up to laundry day, plus one spare.
- Sleepwear: one set.
- Shoes: two pairs at most. Wear the bulkier pair.
- Layers: one warm layer (worn on the plane) and one rain shell.
- Swimsuit: two if you'll swim a lot, so one can dry.
- Mix and match. Pick a color palette so every top goes with every bottom, and dress one outfit up with accessories instead of packing a second "nice" one.
Laundry is the secret
The difference between a one-week list and a two-week list should be a laundry day, not a second bag.
- Plan a laundry day halfway through, and you need about half the clothes.
- No washer? A few detergent sheets or a small bar of laundry soap and a universal sink stopper let you wash underwear, socks and tops in a sink. Quick-dry fabrics make this work overnight.
- Old underwear trick: some travelers pack worn-out underwear and socks and throw them away as they go, freeing space for souvenirs.
- Creases: hang clothes in the bathroom during a hot shower.
Worked example: one adult, one week, laundry on day 4
- Tops: 4
- Bottoms: 2 packed + 1 worn
- Underwear: 5
- Socks: 5
- Sleepwear: 1
- Warm layer: 1 (worn)
- Rain shell: 1
- Shoes: 1 packed + 1 worn
- Swimsuit: 1 or 2
Two weeks? Same counts, with laundry every 4 days or so (around days 4, 8 and 12). The bag doesn't get bigger. The laundry kit does the work.
Step 3: Toiletries and liquids
Under the TSA's 3-1-1 rule, each traveler can bring liquids, gels, aerosols, creams and pastes in containers of 3.4 oz (100 ml) or less, all fitting in one quart-size bag. Rules elsewhere differ, and some airports outside the US have changed their limits, so check the rules at every airport on your route, including the one you fly home from.
Exemptions worth knowing:
- Medication in larger amounts is allowed. Tell the officer.
- Formula, breast milk, toddler drinks and baby food over 3.4 oz are allowed in reasonable quantities, outside the quart bag (TSA). Declare them at the start of screening.
How to make the quart bag go further:
- Go solid: bar shampoo, solid conditioner, solid deodorant and toothpaste tablets are solids, so they stay out of the quart bag. Check TSA's What Can I Bring tool if you're unsure about an item.
- Decant into small refillable bottles. You rarely need more than a couple of ounces of anything for a week.
- Buy it there: sunscreen, shampoo and big bottles of anything are easy to find almost everywhere.
- Keep a toiletry bag permanently packed so it's ready to grab.
- Walk through your morning routine as you pack: toothbrush, deodorant, contacts and case, hairbrush, razor. Our most forgotten items guide has the full routine.
Step 4: What to wear on the plane
Your body is the biggest free storage space you have.
- Your heaviest shoes (boots, sneakers).
- Your bulkiest layer (jacket, fleece, sweater). Take it off on board and use it as a pillow.
- Jeans or heavier trousers.
- A scarf or wrap, which doubles as a blanket.
- A jacket with pockets for the phone, passport and headphones, so they're not taking up bag space.
Keep these on you
- Medication for the whole trip, plus a couple of days' spare.
- Passports and IDs.
- Chargers and wall bricks. On international trips, one plug adapter with USB ports can charge several devices.
- A power bank. Spare lithium batteries must stay in the cabin, never in a checked bag, per the FAA. If your bag gets gate-checked, take it out.
- Headphones.
- Trip details saved offline.
Carry-on only with kids
Yes, families do it, and the ones who pull it off share a few habits:
- Buy diapers and wipes at your destination. Pack the travel day and a delay day, and buy the rest. Our toddler flight guide has the carry-on diaper math.
- Gate-check the stroller and car seat. They generally don't count toward your allowance, but check your airline.
- Kids' clothes are small, but kids under 5 still need a spare outfit a day. With laundry, you only need those spares until laundry day.
- One shared toiletry and first-aid pouch for the family instead of one each.
- Split everyone's outfits across bags. If one bag goes missing or gets gate-checked, nobody loses their whole wardrobe.
- Give older kids their own small backpack for their activities, headphones and a layer.
Age-by-age
- Baby (under 12 months): feeding supplies take the space. Buy bulky consumables there, and use a carrier so you have hands for bags.
- Toddler (1 to 3): spare outfits, the comfort item and snacks go in the parent's personal item, where you can reach them.
- Kid (4 to 8): a small backpack they carry themselves, with a few outfits packed in a single cube.
- Tween (9 to 12): they can carry a full carry-on. Give them the outfit formula and let them pack it, then check.
What people forget
What people forget: the airline's personal item size. Carry-on sizes are similar across big US airlines. Personal item sizes are not.
What people forget: the return flight's rules. A different airline or airport on the way home can mean different bag and liquid limits.
What people forget: the laundry kit. Without it, your laundry day plan becomes a laundromat hunt.
What people forget: the power bank in a gate-checked bag. Take it out before you hand the bag over.
Printable checklist: carry-on only (one adult, one week)
Rule of thumb: tops about 1 per day and bottoms 1 per 2 to 3 days, up to your first laundry day. This example assumes laundry on day 4. Check your airline's carry-on and personal item limits for your fare before you pack.
Bag check
- Carry-on size and weight limit checked for my airline and fare
- Personal item size checked
- Return flight's limits checked
Clothes
- Tops: 4
- Bottoms: 2 packed + 1 worn
- Underwear: 5
- Socks: 5
- Sleepwear: 1
- Warm layer (worn)
- Rain shell
- Shoes: 1 packed + 1 worn
- Swimsuit: 1 to 2
Laundry kit
- Detergent sheets or laundry soap bar
- Universal sink stopper
- Packing cube for dirty laundry
Toiletries (quart bag, 3.4 oz or less each)
- Toothbrush and toothpaste (or tablets)
- Deodorant (solid saves space)
- Shampoo and conditioner (bars save space)
- Skin care and sunscreen
- Contacts, case and solution
- Hairbrush and hair ties
- Razor
Keep on you
- Medication for the trip + 2 days
- Passport or ID
- Phone, charger and wall brick
- Power bank
- Plug adapter with USB ports (international)
- Headphones
- Trip details saved offline
Organizers
- Packing cubes
- Zip bags for wet swimsuits and leaks
Family add-ons
- Travel-day and delay-day diapers (buy the rest there)
- Spare outfit per day for kids under 5, until laundry day
- Shared toiletry and first-aid pouch
- Outfits split across bags
- Stroller and car seat for gate check
Let Packworthy keep it carry-on sized
Packworthy builds a list for each traveler sized to your trip, inside one shared family trip, and on long trips clothing counts stop at a sensible number. It already asks what bag you're bringing, but it doesn't change the list yet. Carry-on only mode is coming soon: a bag capacity budget for your trip and a fill meter that shows how full your bag is getting as items go on the list, so you can trim before you pack, not at the zipper. Outfit planning by day is coming soon too.
FAQ
How many outfits do I need for a week carry-on only? With a laundry day around day 4, about 4 tops, 2 bottoms plus the pair you wear, 5 pairs of underwear and socks, one sleep set, a warm layer and a rain shell.
What size is a carry-on bag? For big US airlines like United, American and Delta, about 22 x 14 x 9 inches, plus a personal item that varies by airline. Budget and international airlines can be smaller, and basic economy fares may not include a carry-on. Check your airline and fare.
Can I bring full-size toiletries in a carry-on? Not under the TSA's 3-1-1 rule: containers must be 3.4 oz (100 ml) or less, in one quart-size bag. Medication and baby formula, breast milk and baby food are exempt. Solid toiletries are a good workaround.
Can a family travel carry-on only? Yes, especially with laundry access. Buy diapers at your destination, gate-check the stroller and car seat, share one toiletry pouch, and split outfits across bags.
How do I pack carry-on only for two weeks? Pack the same amount as for one week and do laundry every few days, about three times over two weeks. A small laundry kit is what makes it work.