Most airlines use a standard maximum carry-on size of about 22 x 14 x 9 inches (56 x 36 x 23 cm), including wheels and handles.

Typical carry-on size limits

  • Common “universal” max size: 22 x 14 x 9 in / 56 x 36 x 23 cm.
  • This is often enough for a 35–45 L suitcase or backpack.
  • Weight limits usually range from 15–22 lb (7–10 kg), but some U.S. airlines have no formal weight limit as long as you can lift the bag yourself.

How airlines differ

  • Many major U.S. carriers (American, Delta, United, JetBlue) use 22 x 14 x 9 in.
  • Some airlines allow slightly larger dimensions (e.g., 24 x 16 x 10 in), but that will not be accepted everywhere.
  • European and some Asian carriers can be stricter and may require smaller bags or enforce weight limits more closely.

Here is a quick illustrative table of sample allowances:

Airline example Max size (inches) Max weight
Typical “universal safe” size 22 x 14 x 9 15–22 lb (7–10 kg)
American / Delta / United (sample) 22 x 14 x 9 Often no set limit, must lift to bin
Stricter carriers (sample) Approx. 21.5 x 15.5 x 8–9 15–22 lb (7–10 kg)
More generous carriers (sample) Up to 24 x 16 x 10 Varies, sometimes no set limit

Quick practical tips

  • If you want one bag that works “almost everywhere,” choose a carry-on no larger than 21–22 x 14 x 9 in.
  • Always check your specific airline and ticket type (basic economy vs. standard) shortly before flying, because 2026 enforcement is tighter and rules change.
  • Remember that many airlines also allow a smaller personal item (like a backpack or tote) that must fit under the seat.

TL;DR: For “what size is carry on luggage,” the safest rule is to keep your main bag at or under 22 x 14 x 9 inches, including wheels and handles, and confirm your airline’s exact policy before you pack.

Information gathered from public forums or data available on the internet and portrayed here.