Addison Peterson wrote an answer about CamelBak H.A.W.G. NV Hydration Pack - 1159cu in on May 13, 2012
I use mine for school. I'm able to fit my 15" mac book pro, an 1 1/2" binder and a regular upper division textbook. It can get a little tight, so I try to lean more towards e-books on my ipad. Which fits great in the front pocket.