Compact, light and versatile. I recently used the bag for a 6 day trip overseas, no check-in required. Big enough for hand-carry, properly packed, the whole bag was light and could fit three more tshirts I bought during the trip. Currently using my Kanken as a laptop bag, and there is quite a lot of empty space in there, while my husband uses his as a camera bag (fits a Mamiya Universal <3).
The only issue is they have so many colours and I need them all. I also wish the peach pink Kanken had peach pink straps as well, instead of blush pink straps.