Bob's Quick Take: The TETON Sports Celsius Regular 0 Degree Sleeping Bag is a roomy, flannel-lined rectangular sleeping bag made for car camping, family camping, campground weekends, and cooler nights when comfort matters more than ultralight packing. It is a strong fit for campers who want a warmer, cozier bag without moving into pricey backpacking gear. The big caution: treat the 0 degree label carefully, because TETON identifies its temperature ratings as survival ratings, not guaranteed comfort ratings.