Mammoth Double 2-Person Sleeping Bag. Keep your sleeping options open with this versatile, rectangular sleeping system. For a cozy night with a friend, the two halves zip together to form a 2-person sleeping bag. If you’d prefer to sleep solo, the two halves zip apart to form two 1-person sleeping bags. Either way, the polyester pongee liner will keep you warm and toasty down to 35°F. Comes in compression carry bag packaging. 3 in 1 design: Can be used as a single 6 lb, 2 person bag, or zipped apart and used as two 3 lb, 1 person bags. 35-45°F cool weather sleeping bag. Polyester shell with polyester pongee liner. Dimensions: As a double, 87 in. Long x 66 in. As 2 singles, 87 in. Long x 33 in. Wide and 75 in. Add to Favorite Sellers.