I bought this pack as my go-bag (I'm a disaster responder with the American Red Cross) and it ROCKS! I carry it everywhere. The hydration pack obviously holds a camelbak or whatever system you have, but it's a really secure place to keep your laptop. I always keep an advanced aid kit, and some other disaster gear in the outter pockets, and then larger items like coldweather clothing, or climbing gear, or whatever is needed. I know I can comfortably carry up to 70 pounds for up to 6 miles without serious discomfort. Also with the suspension system, it makes for a good climbing pack.