Campus 600ml フリップキャップボトル - Sunshine & Rainbow

The button flip cap is genuinely one-handed, which is great when I'm carrying my laptop and coffee at the same time. It hasn't leaked once in my backpack, and the 600 ml size gets me through a whole lecture.

Filled it with sparkling water and it held up fine, no leaking in my bag on the way to class. The cap staying flipped up while I drink is handy since I don't have to hold it back with my thumb.

The click-to-close cap is weirdly satisfying and it actually seals tight, no leaks in my bag so far. At 600 ml it fits my bike bottle holder perfectly. The button pop-open takes a second to get used to but I like drinking without unscrewing anything.