TOM BIHN Techonaut 30, Convertible Travel Backpack, 30L

The interior layout with those six O-rings is genius—I clipped my toiletry bag and chargers in place and nothing shifted during two weeks of flights. The 30L size is the sweet spot for overhead bins, and the strap carried much better than I'd expect for a bag this boxy.

The six internal O-rings are a game-changer for me—I tethered my toiletry bag and tech pouch to them and nothing shifted during a bumpy two-hour train ride. The convertible straps take a minute to figure out, but once they're set, it carries like a proper pack and still fits in the overhead bin.

The 30-liter size hits the sweet spot for carry-on travel, and the way it converts from backpack to duffel feels almost seamless. I've loaded it up for a week-long trip and the interior stays surprisingly organized with those tether points.