HIGH TAIL DESIGNS Ultralight Roll-Top Stuff Sack "Medium" This is the M size. I have used it for mountain trips. There are wrinkles from use, but it is still usable. The design is also valuable as it is no longer available for purchase. The M size is 9L and is useful for compactly packing a 3-season sleeping bag, down jacket, and spare clothes. It doesn't absorb water and is very lightweight. Thank you for your consideration. moonlight gear