The unsnapped sides are the real trick here — I fit a full change of clothes in there and it still slides under the seat in front of me. Small enough for the daily commute but it swallows way more than it looks like it should.
William P.★★★★★
Bought this for weekend trips and it's shockingly roomy once you unsnap the sides — I fit a full change of clothes plus my toiletry bag in there. The small size still slides under the seat fine, which is exactly what I wanted.
Hannah★★★★★
Snapped it shut for my commute and it stayed slim against my back on a packed train, then I unsnapped the sides at the gym and fit a full change of clothes inside. That side-snap trick is the whole reason this small size works.