TL;DRIf you check a bag, pack one complete outfit (including underwear, a clean shirt, and basic toiletries) in your carry-on. About 5 bags per 1,000 passengers were mishandled in 2025 (most of them delayed), and the first 48 hours are the worst time to discover you have no clean clothes.
Mishandled baggage rates have improved over the past decade: SITA's 2026 baggage report puts the 2025 rate at 4.9 bags per 1,000 passengers globally, a record low. But transfers still cause 39% of mishandled bags, and the odds get worse on tight connections, on transfers between partner airlines, and at hub airports during weather disruptions. If you're checking a bag, plan for the day your bag is delayed.
The carry-on outfit isn't paranoia. It's the single thing that turns a 24-hour bag delay from a trip-ruiner into a footnote.
What goes in the carry-on backup
One change of clothes that covers the first 24–36 hours:
- 1 pair underwear
- 1 pair socks (or extras if hiking)
- 1 clean shirt (in the destination's climate, t-shirt if hot, base layer if cold)
- 1 pair pants if your trip starts somewhere requiring a different climate (e.g. you fly from Chicago in winter to Bangkok, shorts in carry-on)
- 1 thin sleep layer if you're sensitive
- Toothbrush, toothpaste, deodorant, basic skincare in TSA-compliant containers
- Phone charger (always)
- Any medications you'd hate to be without for 48 hours
- One thing that signals "you're on vacation", a book, headphones, swimsuit if you're going to the beach
This bundle takes up roughly half of a personal-item-sized bag. Use a packing cube to keep it together so it doesn't migrate.
What the airline owes you (and doesn't)
Under DOT rules for US domestic flights, airlines must reimburse "reasonable, verifiable, and actual incidental expenses" for delayed bags, and they may not set an arbitrary daily cap. You'll typically need receipts, a Property Irregularity Report (PIR) filed with the airline, and patience for the claim process. If a domestic bag arrives more than 12 hours late (15 or 30 hours on international flights, depending on flight length), DOT rules also require the airline to refund your bag fee.
International itineraries fall under the Montreal Convention, which caps total liability at 1,519 Special Drawing Rights (about $2,060 in October 2026) per passenger across all bag-related claims for that journey, and that includes lost or damaged bags too.
Bottom line
Five minutes of carry-on planning saves the trip if your bag goes to Frankfurt while you go to Lisbon. Treat the personal item as a 36-hour survival kit, not a place to stash a magazine. If your bag arrives on time, you've lost nothing. If it doesn't, you've kept the trip on track.
