TOM BIHN Daylight Backpack, Packable Daypack, 17L, 11.5" x 17" x 5"

Took this on a three-day trip and the 17L size was perfect for a spare outfit plus my kindle and toiletries. The way it collapses flat into my suitcase when I’m not using it is honestly the smartest thing, and the straps hold up way better than I expected for how light it is.

The fact that it folds down flat enough to slip into my main suitcase is a lifesaver, but the 17L main compartment still swallows my 13-inch laptop and a day's worth of snacks. The 11.5" x 17" footprint fits under an airplane seat with room to spare, and the shoulder straps are comfortable even when

Been using this as my personal item on flights and the 17L size fits my 13-inch laptop plus a jacket without bulging. The way it collapses flat into my suitcase when I don't need it is honestly the best part, and the shoulder straps don't dig in even when it's packed full.