Five down bags and five insulated mats compared by comfort rating and R-value, for building one sleep system instead of judging a bag alone.
If you picked a bag by its temperature rating and still woke up cold, the heat was probably escaping through the ground, not the air above you. This list puts five down sleeping bags and five insulation mats side by side, treating them as one sleep system instead of judging a bag on its own.
Use the comfort rating, not the limit rating, to judge a bag's season, and use R-value to judge how well a mat blocks ground cold. Match both to your actual camping season and how you travel.
01
Sea to Summit Spark Down Sleeping Bag
For backpackers shaving every gram, this bag's packed size matters as much as its warmth. Its 850-fill goose down compresses well, but judge the season by the 'comfort' rating printed on the tag, not the lower 'limit' figure β that's closer to what you'll actually feel. Weight varies by size and temperature rating, so match the model to your destination's expected low.
02
Sea to Summit Trek Down Sleeping Bag
If a snug mummy bag feels too confining, this roomier cut is the alternative. The zipper opens flat enough to use like a quilt, which is convenient, but that extra room also takes longer to warm up with body heat. Down loses insulating power once damp, so keep it in a separate waterproof dry bag while traveling.
03
NEMO Disco 15
Side sleepers who shift position through the night notice the difference a spoon-shaped cut makes at the knees and elbows. It's rated at 15Β°F (about -9Β°C), but that kind of number can vary by several degrees depending on your own metabolism and what you're wearing underneath, so treat it as a conservative estimate. Regular and long sizes, plus gendered cuts, are both available β match to your height.
