This stuff sack for dog beds helps shape all your old clothes, pillows and blankets to create a comfy mattress for the duvet cover. This stuff sack is machine washable. This means that when it's time for a wash, the stuff sack and all its contents can go right into the wash. Your dog is comforted by your scent! Dogs that are restless or suffer from separation anxiety are naturally calmed by the dog bed stuff sack - because it carries your scent even when you are not home! This dog bed stuff sack is in medium/large size and measures 27” x 36” x 5”. The washable stuff sack is made of 100% nylon and has a zipper on one short side.