This is the ISUKA sleeping bag storage bag, size L. Down sleeping bags will get crushed if stored in their stuff sacks. Also, poor ventilation can cause mold. Therefore, it's best to store them in a storage bag. The storage bag L is the perfect size for storing winter sleeping bags. Brand: ISUKA Color: Natural Fabric: 100% Cotton Size: Diameter 35 x 76cm (L) Weight: 130g