I am selling this item because I no longer have a use for it. I have used it twice for camping. The storage sack is a bit dirty, but the main body is in good condition. Please understand that this is a used item and consider purchasing it. Here are the product details: Retail Price: ¥13,200 (tax included) Product Model Number: SL002 Size: When in use / W86 x L220cm When stored / Diameter 12 x H20cm Material: Tyvek® Silver (polyethylene, aluminum) Weight: 265g (270g including storage case) This is a sleeping bag cover made of Tyvek® Silver, which is Tyvek® (Tyvek) with aluminum vapor-deposited on the back. With excellent waterproof and breathable properties, it protects your sleeping bag from condensation inside the tent while keeping you comfortable and dry. The inside of the fabric is aluminum vapor-deposited, which reflects up to about 80% of body heat, significantly increasing heat retention. It can also be used alone and is useful for summer mountain trekking and camping.