A lightweight and water-resistant rain cover designed to protect your backpack from nature's elements. The '30-40' size fits backpacks from 30 to 40 liters in volume. The Rain Cover has extra volume to accommodate and protect commonly used tripods. It will fit easily over a tripod on a 30 liter pack, and fit more snugly on a 40 liter pack. It secures to the pack at three points: to the top handle, and to both sides of the waist belt. When not in use, the Rain Cover compresses into to a small self-contained pouch for easy storage.