This is a convenient item for further compressing Montbell's compact sleeping bags and storing them in backpacks or other items with less space. This item has only been opened once after purchase. Specifications [Material] 30-denier Polyester Ripstop [Urethane Coating] [Weight] 64g [Color] Gray (GY) [Applicable Storage Size] Φ21 x 29cm (minimum) Φ25 x 59cm (maximum)