The size information on almost all Rain Covers are relatively inaccurate. When Jack Wolfskin Rain Cover S purchased here there is only the size specification suitable for backpacks up to 30 liters. My backpack of "The North Face", Model "surge" has according to manufacturer a capacity of 32 liters and the size H = 50 cm x 35 cm x B = T = 21cm. I suspected that the Rain Cover S fits over the filled backpack and it was that way. There is even some room available. The Rain cover is packed in a small bag, which is made of the same material as the Rain Cover. Both parts are firmly sewn together. Packing and unpacking easy going. The cover is easy to quickly pull us over the backpack. A restressable Gummibåd fixes the shell backpack.