Maker here. I kept hitting the same question every trip — "will this actually fit the sizer?" — and noticed every packing tool stops at a checklist and never answers it. So PackFitter estimates the liters your trip really needs, the carry-on size that fits, and checks your bag against the airline. The part I care most about: the airline data is honest. I verify all 37 airlines against their official baggage pages, show a "last verified" date, and publish the whole dataset openly (CC-BY) at packfitter.com/airline-data. Where an airline doesn't publish a personal-item size (Delta, Southwest, and others just say "must fit under the seat"), the tool says exactly that instead of inventing a number — most tools quietly make one up. Free, no login, no ads. Analytics are consent-based (you opt in or it stays off). Would genuinely love feedback on which airlines or edge cases I'm getting wrong — corrections go straight into the dataset.

PackFitter

Does your bag actually fit your airline? Find out free.

Does your bag actually fit your airline? Find out free.