A-02Underseat
Underseat 18
Sits near the usual ceiling for this space
- Empty, unexpanded
- 40 × 25 × 20 cm
- Capacity
- 18 L
- Build
- Semi-structured
USD only · Ships from Florida, USA
Free standard US shipping over USD 69

A-01Underseat Bags
The smallest step in the line
The shortest and shallowest bag we build. It exists for the rows where the space between the seat legs is narrower than the space is deep.
One-time purchase. No subscription, no membership, no recurring charge.
All prices and transactions are in US Dollars (USD).
Free standard US shipping over USD 69. Unused and unopened returns accepted for 30 days — see the refund policy.
Gives up to 4 cm against a fixed opening.
01Measured
Taken off the finished piece, laid flat, with nothing clipped to the outside. Handles and hardware are inside every figure.
Empty, unexpanded
36 × 22 × 18 cm
Filled, as listed
36 × 23 × 19 cm
Loaded with
A loaded figure is only published when we can also publish what was inside it. Where you do not see a loaded row, it is because that record does not exist yet — not because the bag stays the same size when it is full.
02Check it against your own limit
We subtract them from the figures above and show the gap on every edge. No verdict, no promise — the arithmetic and nothing else.
Size Ledger
Take the three numbers your carrier publishes for your ticket and type them in. We hold no carrier data of our own, so nothing here can go out of date.
We compare numbers, not policies. Airlines change limits and measure differently at the gate.
Arithmetic result
A-01 · Underseat 14
Waiting for three numbers
Nothing is compared until you type a limit. We do not guess, and we do not store a list of anyone else’s rules.
03Specification
Sprayed with 2 L of water at 20 °C from 30 cm for 3 minutes, closed and held at 45°. Zippers, seams and the base panel are not sealed and are not part of the test.
This is a resistance rating under the stated test, not a waterproof rating.
Rated to 7 kg. Damage caused by carrying more than the rated load is wear, not a fault — see the product safety page.
Details
04More from line A
A-02Underseat
Sits near the usual ceiling for this space
A-03Underseat
For rows where the space is shallow, not narrow
A-04Underseat
Two heights, for outbound and for the way home