Mountaineering Camping Sleeping Bag Ultralight Waterproof 4 Seasons Warm Envelope Backpack Sleeping Bag can be spliced Traveling  [Product Name]: Envelope sleeping bag (single person with cap)  [Material]: 190T waterproof polyester  [Lining]: High quality Hollow Cotton  [Filler]: 1.1kg(200g/㎡Hollow Cotton )  1.4kg(300g/㎡Hollow Cotton )  1.7kg(400g/㎡Hollow Cotton ) [Specifications]: Bag length 190cm, Cap length 30cm, Total width 75cm [Color]: Blue; Green [Splicing status]: Can be spliced [Applicable scene]: Mountaineering Camping Fishing Hiking [Structure]: Envelope style [Size]: (74.8 + 11.8)* 29.5inch  (190+30)* 75cm/(74.8+11.8)* 29.5inch [Category]: Cotton sleeping bag [Fabric]: Polyester ★ Selection of sleeping bags Choose sleeping bags according to your height and local temperature. Too long sleeping bags and too heavy thickness will only allow you to carry more weight ★ keep warm before sleeping Drink a cup of hot boiled water before bed to warm up; Or do warm up before bed; Put your clothes on your bag; Wrap the water cup with hot water in clothes and put it in the sleeping bag. ★ Use of sleeping bags In the use of sleeping bags, keep dry, because the degree of warmth is greatly reduced after the sleeping bag is wet, and it will not keep warm at all. So when you are in heavy rain or water, protect your backpack from water. Or seal the sleeping bag with a sealed bag in advance. After the sleeping bag is wet, it should be dried or dried by air when the conditions permit. The wet sleeping bag cannot be kept for a long time, otherwise it will become moldy or even decay ★ Sleeping bag maintenance In case of long-term non use, it is necessary to keep down and cotton in a loose and free state as far as possible, so as to keep down and cotton nature and prolong service life, especially down sleeping bag, and store it in special down sleeping bag as much as possible in cotton woven bag. Sleeping bags are used as the sanitary crystal for the close fitting, and they should be avoided from borrowing from each other. Chemical fiber cotton sleeping bag and fleece sleeping bag can be washed directly, if the washing machine is large enough, it can also be machine washed. When drying, try to lay or hang up multiple places to avoid sagging. Down sleeping bag washing method: according to the down expert's suggestion, the down sleeping bag can be cleaned once about 4 years. The service life is about 10 to 12 years, and can be cleaned 3 times. If not too dirty, it can be cleaned simply, such as cleaning surface materials with towel sticking gasoline. Sleeping bags are often dirty in outdoor sports, and there are more cleaning times. The cleaning methods are as follows: hand washing or professional machine wash. Hand wash with special down detergent immersion, rinse clean can, do not rub too much, do not twist. If you want to machine wash, please hand it to a professional washing company. After cleaning, air dry or dry, confirm the drying and pat gently, and store it into sleeping bag storage bag after natural expansion. Matters needing attention： Do not use alkaline detergent for down sleeping bag washing, avoid twisting, and do not bake and dry by fire.