This backpack allows you to carry your SLR with lense, and 3 to 5 additional lenses and your laptop up to 15.6''. Its water resistant zippers and its raincover will allow you to profitter in all weathers. His back and padded shoulder straps will allow optimum comfort. Its dedicated pockets for accessories allow you to store your memory cards, cables or additional bateries. The opening on the side of the bag provides you direct access to your camera.