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== Design types == | == Design types == | ||
[[image:Mummy bag.jpg|thumb|300px|A mummy bag]] | [[image:Mummy bag.jpg|thumb|300px|A mummy bag]] | ||
A basic sleeping bag is simply a square [[blanket]], fitted with a | A basic sleeping bag is simply a square [[blanket]], fitted with a zipper on two sides allowing it to be folded in half and secured in this position. A sleeping bag of this type is packed by being folded in half or thirds, rolled up, and bound with straps or cords. The basic design works well for most camping needs but is inadequate under more demanding circumstances. | ||
The second major type of sleeping bag, sometimes called a '''mummy bag''' because of its shape, is different in a number of important ways. | The second major type of sleeping bag, sometimes called a '''mummy bag''' because of its shape, is different in a number of important ways. | ||
* It tapers from the head end to the foot end, reducing its volume and [[surface area]], and improving its overall heat retention properties. Some bags are designed specially to accommodate women's body shapes. | * It tapers from the head end to the foot end, reducing its volume and [[surface area]], and improving its overall heat retention properties. Some bags are designed specially to accommodate women's body shapes. |