Duck CheckedDecision tool · Sources checked July 26, 2026
Will this measured bag fit the airline limit?
The checker can prove whether three external dimensions sit inside a published numeric limit. It cannot promise overhead space, under-seat clearance, or what happens on your exact aircraft.
Measure the bag you are actually taking
Use the outside edges at the bag's widest points. Measure the damn wheels too. Put the longest number first so the checker never rotates your answer behind your back.
Airline rules checked
The exact rules behind the answer
Each record expires on its review date. If we miss that refresh, the checker returns unknown instead of quietly serving an old number.
The bag still has to fit the airport sizer and the available aircraft storage.
Read American Airlines baggage policy (opens in a new window)Delta also states a 45-linear-inch carry-on maximum.
Read Delta Air Lines baggage policy (opens in a new window)Southwest counts wheels, handles, and attachments in the carry-on dimensions.
Read Southwest Airlines baggage policy (opens in a new window)The carry-on still depends on available overhead or under-seat storage.
Read JetBlue baggage policy (opens in a new window)
Before you trust the result
Retail dimensions can be slippery
Measure the packed bag yourself. A product page may list the shell, the packing compartment, or a rounded marketing number. Airlines care about the object that has to enter the sizer.
- Extend nothing. Compress nothing you cannot keep compressed.
- Count wheels, feet, hard handles, and stuffed outside pockets.
- Use the longest, next, and thickest outside sides in that order.
- Check every operating airline on a multi-airline itinerary.