Not only do you save money in the long run because you won’t have to replace gear as often, but it's also more environmentally friendly. At $727, the Feathered Friends Flicker UL Quilt Sleeping Bag ...

and the shape sits in between a narrow mummy and a rectangular sleeping bag, allowing a bit more wiggle room and for the bag to function as a quilt, and making this a good choice for side sleepers ...