I have long searched for something. The Lowepro Rover AW 45L combined finally a modern backpack with the requirements for the safe accommodation of a high quality DSLR / Speigelreflexkamera including lenses. (Possession of the 5D mark3). I had also never take the backpack as hand luggage at Intercontineantalflügen problems. Here I have all my sensitive valuables stowed for travel (DSLR, lenses, Ultrabook, GPS). While hiking I have the Camelbak 2L Antidote bladder with it, which allows a space-saving storage of beverages.