Therm-a-Rest Boost 650 20F/-6C Sleeping Bag — Regular

Where it makes sense

The Boost 650 gives a camper a way to experiment with a roomier or narrower bag shape without switching bags. The center zipper changes the interior arrangement, while separate openings allow adjustment and venting. Its published temperature table makes a useful distinction between comfort and limit, which matters more than the shorter number in the name. It is a fit-oriented option for someone who finds a conventional mummy restrictive but still plans to carry the kit. Compare the complete Regular-size weight with simpler bags. The shape-adjustment feature does not create a second standardized temperature rating, so this listing does not subtract degrees from the published comfort value.

Documented specifications