The Osprey Rev 12 is an excellently designed pack—one of a series from Ospery, ranging in size from 1.5L to 24L—and is also one of the most comfortable we’ve ever tested. It has many of the bells and whistles of a hiking daypack, yet rides smoothly and bounce-free on hard-charging mountain runs.
For being one of the largest packs I tested in this roundup, the Osprey Rev 12 also rides amazingly well and bounce-free. It’s part of Osprey’s relatively new Rev line of trail-running packs, which include 1.5L, 6L, 12L, 18L and 24L options. With a nod to Osprey’s heritage as a successful backpacking company, the Rev 12 is unusual in the trail-running world for coming equipped with a hip belt and more substantial mesh harness system to promote breathability between your back and the pack. Incredibly, these features do not feel like overkill on the pack; rather, they help it ride exceptionally smoothly, even when fully loaded with gear.