Why a carry-on size checker helps
Budget airlines live on bag fees. A Ryanair weekend on a basic fare includes one small bag that fits under the seat; anything bigger costs extra, often at the gate. Long-haul economy is more generous on size but some airlines set tight weight limits. Wayfold’s carry-on check puts the rule for your exact airline and fare next to the bag you’re packing.
You see a size diagram, a weight bar against the limit, and a status: green (OK), amber (near the limit) or red (over). If you’re over, Wayfold suggests moving the heaviest items – “Move 3 heavy items to checked?” – and the bar turns green when it fits.
19 cabin-bag rules across 15 airlines
The check covers easyJet, Ryanair, Wizz Air, British Airways, Virgin Atlantic, Delta, United, American Airlines, Southwest, Spirit, JetBlue, Lufthansa, Air France, TAP Air Portugal and Emirates – including both the small under-seat bag and the larger cabin bag where an airline sets different rules by fare. A few examples:
| Airline and fare | Bag | Max size (cm) | Max weight |
|---|---|---|---|
| easyJet Standard | Under-seat bag | 45 × 36 × 20 | 15 kg |
| Ryanair Basic | Under-seat bag | 40 × 30 × 20 | None published |
| Ryanair Priority & 2 cabin bags (paid) | Cabin bag | 55 × 40 × 20 | 10 kg |
| British Airways Economy | Cabin bag | 56 × 45 × 25 | 23 kg |
| United Basic Economy | Personal item | 43 × 25 × 22 | None published |
| Delta Main Cabin | Cabin bag | 56 × 35 × 23 | None published |
Each rule in the app is dated (“checked September 2026”) and links to the airline’s own baggage page. For more detail, see the airline carry-on sizes pages.
How the weight estimate works
Wayfold adds up the items assigned to that bag, using typical weights for each item, and includes the empty bag itself. It’s an estimate to help you decide before you pack, not a scale. When an airline publishes no weight limit, Wayfold checks size only and says so.
Liquids
The carry-on screen also includes a liquids note: most airports still limit cabin liquids to containers of 100 ml (3.4 oz) in one clear 1-litre bag, while some airports with newer scanners allow more. Check your departure airport before you fly.
Works with your outfits and your list
Carry-on check pairs naturally with the outfit planner: plan a small capsule wardrobe, then see whether it fits the bag. Because the check reads your packing list directly, moving an item to checked or deleting it updates the result immediately.
Pro, offline, and what it doesn’t do
Carry-on check is part of Pro ($4.99/month or $29.99/year with a 7-day free trial; Lifetime $69.99 as a launch offer; UK prices £4.49, £26.99 and £64.99; prices may vary by region). The rules ship with the app and work offline.
Airlines change cabin-bag rules, and your fare, route or loyalty status can change what’s included. Wayfold shows the date each rule was checked; always verify with the airline before you fly.
Wayfold is coming soon to iPhone and Android.
Questions about the carry-on check
Which airlines does the carry-on size checker cover?
Fifteen airlines with 19 cabin-bag rules, including easyJet, Ryanair, Wizz Air, British Airways, Virgin Atlantic, Delta, United, American Airlines, Southwest, Spirit, JetBlue, Lufthansa, Air France, TAP Air Portugal and Emirates.
How does Wayfold know how heavy my bag is?
It estimates from typical item weights plus the weight of the empty bag. Weigh the packed bag at home if you’re close to the limit.
What size is a Ryanair free under-seat bag?
As checked in September 2026, 40 × 30 × 20 cm on the Basic fare. See the Ryanair carry-on size page and confirm with Ryanair before you fly.
Is the carry-on check free?
It’s part of Pro, with a 7-day free trial. See pricing.