Lowepro Protactic BP 450 AW II
Lowepro currently has two backpacks in the Protactic range. The Protactic 450 and 350. The Protactic 450 is best suited if you have a camera or two with a battery grip as the depth of the bag is sufficient. Obviously the overall size of the Protactic 450 is larger than the 350. You can find a link to the Lowepro Protactic BP 350 AW II on this page if you wish to compare.