MSR Colorado Single Trak Pak

The best made pack I have ever seen. I carried it on my back through Baja Mexico for four days and it held up flawlessly. Pockets hold more than you would expect. There are numerous inside pockets and a special space for a water bladder. Also, the zippers are the most heavy duty type I have ever seen (and are self-repairing). The pack material is also heavy duty (very very strong - not like anything else on the market). Many many other features and ergonomic too. The pack is relatively heavy for its size but if that bothers you (for a day trip) then go get a lightweight pack.