I've got a similar backpack, made by EMS. It's a "good" bag, but I didn't like it. The foam back made me sweat like crazy, despite the air channels. I think it's an OK day-pack, for light loads. But if for a true BO, think bigger. This bag would hold the 10 essentials, a water bladder, and probably squeeze in a fleece jacket. Anything else would start stretching its capacity.