What’s the difference between a camping and a backpacking sleeping bag? Sleeping Bag Weight for one thing. In general, camping bags offer plenty of room to move around in, while backpacking bags are light and snug. In general, campers want bags that offer ample room to stretch out and roll over, which is why so many camping bags have a simple rectangular design. Sleeping bags come in three basic shapes: Rectangular: These bags allow plenty of room for both legs and arms to stretch out; some can be completely unzipped and used like a comforter. Semirectangular: Also known as a “modified mummy” or “barrel” shape, this designation covers a variety of shapes, all of which offer a compromise between warmth and roominess. Mummy: In order to boost warmth and cut weight, this bag style has a snug fit—you roll over with your bag rather than inside of it. We have various selection of sleeping bag weight.