TOM BIHN Daylight 後背包，可收納日用背包，17L，11.5" x 17" x 5"

The interior is way more open than the 17 liters suggest—I fit a jacket, a water bottle, and my laptop plus a book without it bulging at the seams. It folds down flat into my carry-on, but once it's on, the straps are so light I forget it's there. Exactly the kind of pack I need for a quick train da

Carried it through three days of city wandering plus a quick trail detour and the straps never dug in once, even with a water bottle and jacket stuffed inside. For a bag that packs down to almost nothing, 17 liters genuinely holds more than it looks like it should.

The whole thing folds down so tiny it disappears into a jacket pocket, yet I just used it for a full day of sightseeing with a water bottle and extra layers inside. Straps are cut well enough that it rode comfortably for hours without digging in—pretty impressive for something this light.