Designed specifically to fit their Rotation Pro 50L+ backpack, the Think Tank Rain Cover offers maximum protection from rain, snow, and dirt while still allowing full functionality of the rotating camera pack, so you don't lose any performance. The two-piece design covers the primary backpack and the secondary camera pack with integrated lashes to hold each piece securely in its place. For added convenience, the cover is sized to accommodate and cover most photo tripods that are carried on the outside of the pack. When you don't need the cover, it easily stows in the included travel pouch.