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Aerolite
Aerolite 40x30x20 Ryanair Wizz Air Under Seat Backpack, Black
A soft backpack that the listing says is designed to measure 40 x 30 x 20 cm, Ryanair's and Wizz Air's free under-seat size, with packing straps, lockable zip loops and a front pocket.
Updated October 10, 2026
- Designed to measure 40 x 30 x 20 cm, the Ryanair and Wizz Air under-seat size (listing)
- Main compartment with packing straps; zips have loops for a padlock (listing)
- Padded, length-adjustable shoulder straps and backrest (listing)
- Can be mounted over a larger case when travelling with more luggage (listing)
- Smaller front pocket for documents and essentials (listing)
Good for
Travellers who want one free bag that fits Ryanair, Wizz Air and easyJet allowances.
Skip it if
Anyone who habitually overpacks a soft bag, or who needs wheels or a padded laptop compartment (the listing does not describe one).
Our take
On this page
Our verdict
This Aerolite backpack is the simplest answer to Ryanair's 40 x 30 x 20 cm rule: the listing says it is designed to measure exactly that size, and because easyJet's free bag can be up to 45 x 36 x 20 cm, it fits easyJet's allowance too. It is soft, so it squeezes under a seat, and it has packing straps, a front pocket and zip loops for a padlock.
The trade-off of building to the maximum is that there is no margin. If you overfill the front pocket, a soft bag bulges past 20 cm deep. The listing does not give a capacity in litres or a weight, and it does not describe a laptop sleeve. The variant trap: Aerolite sells several similar 40 x 30 x 20 cm backpacks, some with a USB port or detachable pouch, and older bags at the previous 40 x 20 x 25 cm size. This link is the plain black under-seat backpack.
Packing to fit
Pack heavier, flatter things against the back panel and keep the front pocket slim. Measure the bag once packed, at its deepest point.
FAQ
Will it fit easyJet's free bag allowance?
Yes, on size. easyJet allows 45 x 36 x 20 cm including handles and wheels.
Is it big enough for a weekend?
That depends on how you pack; the box size is 24 litres at most, and the listing does not quote a capacity.
How we researched this
Checked on 10 October 2026 against the Amazon.co.uk listing and Ryanair's and easyJet's bag pages. Aerolite's own website could not be opened. We did not measure or use this bag.
