I am going hiking soon and need a good waterproof backpack.

BOBLBEE Amphib Pro30 Waterproof Backpack is engineered and manufactured like a large watertight trekking shoe, the Amphib Pro 30 is my top recommendation for the extreme sports user. Extreme water protection, shock absorbing, very light, and a flat stable carrying platform for skis and snowboards. This is a great pack for kayaking, canyoning, or mountain biking during the warmer seasons. Thanks to the body molded shell, the ergonomics are excellent regardless if it is empty or heavily packed. Shoulder straps are made of top quality neoprene to follow the movements of your arms. It features a water tight roll top, a goggle pocket inside the lid, pole/ice axe attachments, quick lock straps for skis and boards, and a built-in shovel guard. The body is made with a Double-shell High Density foam (DHD) with a rip stop nylon mesh.

This roll-top Waterproof Backpack 25 Liter - 6.6 gallons OverBoard 1500 is like no other available! Working just like a roll-top dry bag, the fully welded seamless construction of this PVC and 600D nylon waterproof backpack means you can sit the backpack in a puddle all day long and the water will never soak through. But it is the extra features of this waterproof backpack that you'll fall in love with.

This waterproof backpack floats and is waterproof to 3 feet. It offers many great features such as padded shoulder straps, padded back, padded lumbar, adjustable sternum strap, adjustable waist belt, top carry handle, an outer elasticized bungee, two outer elasticized mesh pockets, and an industry first, an internal pocket. The hanging internal pocket features a zipper closure.

Lowepro DryZone Rover Waterproof Backpack is the world's first backpack designed to safely carry both a hydration system and camera gear all inside the same bag.