Perfect for those all-day adventures, the High Sierra Express Lumbar Pack holds a lot and keeps you hydrated with one side-mounted 500ml GE Lexan(R) shatter-resistant water bottle and space for another. Express also brings you a large, top-load compartment with plenty of room for an MP3 player, a zippered front accessory pocket for keys, IDs and more, and lots of other extras to keep you going.