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The North Face is one of the best known names in outdoor gear, including mummy sleeping bags. In fact, most of the North Face sleeping bag line is made up of mummy sleeping bags. Mummy sleeping bags are the choice of many campers and backpackers for a number of reasons. Mummy bags, shaped to fit your body, keep you warmer because they conform to your body shape and conserve more heat. They also weigh less than rectangular bags, so they are easier to carry on a backpack.