I was looking for a large stuff sack that would accomodate a -10 degree oversize sleeping bag, but even the large stuff sacks only have a 12-14" diameter and the sleeping bag requires a minimum of 15" diameter when it's rolled up tight. This parachute bag works great for packing an oversize sleeping bag (and small pillow) and is made of very heavy duty canvas, has a strong zipper as well as a storm flap (with snaps) to protect the zipper and keep out dust and moisture.