mont-bell Sleeping Bag and Sleeping Bag Cover Set This is an outdoor brand, mont-bell sleeping bag and sleeping bag cover set. It has been used about 3 times, maintained, and then stored. Down Hugger 800 #3 ¥34,100 Breeze Dry-tech Sleeping Bag Cover ¥14,000 This item is worth a total of ¥48,100, but is offered for ¥18,000 (including shipping). It will be shipped in a storage bag (see photo 8). Thank you. The following is an explanation from the manufacturer's website: It uses 800 fill power "EX Down" for the filling. EX Down is a high-quality down made only from waterfowl that have grown up in harsh environments. The down balls are large and dense, so it has very high heat retention. Compared to general 550 fill power down, it has about 30% higher heat retention performance. The fact that it exhibits high heat retention with a small amount means that the storage size is very compact. Another feature is the "Spider Baffle System" structure. Special threads called "Spider Yarn" are stretched inside, and down is entangled with them to prevent the filling from shifting. There is no need for a quilting structure to prevent the filling from shifting, and the seams are minimized, achieving high airtightness = heat retention efficiency.