ARETE 18 1.5L Hydration Pack

Took this on a two-hour hike and barely noticed the weight once I'd filled the 1.5L bladder. It compresses down small enough to stuff in my day bag after, which is honestly why I bought it.

Squished this into my carry-on for a week-long trip and it barely took up any space. The 1.5L bladder was plenty for a full day of hiking once I got there, and it sits close enough that it doesn't bounce around.

Packed this flat in my carry-on and it took up almost no room, which was the whole reason I bought it. The 1.5L bladder is enough for a quick trail run, though I do wish the bite valve had a lock.