How to Choose
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.
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.
These bags allow plenty of room for both legs and arms to stretch out; some can be completely unzipped and used like a comforter.
Bags made for two are the best bet for couples who plan to sleep together. Another option is to choose rectangular bags designed for zipping together—the bags need to be the same model and brand. A few bags also can be zipped together if one person chooses a right-hand zip and the other a left-hand zip.