Camera Backpack, Beschoi Waterproof Camera Bag Photography Bag with Tripod Strap and Rain Cover for DSLR Camera, Camera Tripod, Ipad, Lens and Accessories - KENTFAITH
Backpack Rain Covers - Mountainsmith
Deluge Waterproof Backpack Rain Cover – 3V Gear
Do you need a rain cover for a backpack? - RidgeTrekker