Sleep warm. Carry less.
Independent buyer guides for backpackers — sleeping bags, quilts, pads and sleep-system accessories. The gear compared on the specs that actually matter, the bag-and-pad-as-a-system insight spelled out, and a matcher that tells you the temperature rating and R-value you really need. Written by a backpacker who would rather answer your question than sell you a setup you will freeze in.
Read the sleep-system guide →Specs verified against manufacturer and retailer listings · No fake hands-on claims · Temperature ratings are lab figures (ISO 23537) — never a survival guarantee
Choose your path
Three doors. Where you start depends on whether you are still planning, ready to buy, or just want to know what you actually need.
I'm building my first sleep system
Read the beginner guide. Why warmth is the bag AND the pad, how to read ISO Comfort vs Limit ratings, the R-value you need by season, and the rookie mistakes to skip.
Open →I want to stay warm without the weight
The best backpacking sleeping bags compared — down and budget picks — matched to your overnight low so you carry warmth where it counts and nothing you do not need.
Open →I want to know what I actually need
Use the sleep-system matcher. Enter your overnight low and sleeper type and find the bag ISO Comfort rating AND minimum pad R-value you need as a paired system.
Open →Where to start
Bags & Quilts
Sleeping bags and quilts compared for backpackers — ISO 23537 Comfort vs Limit ratings, down vs synthetic fill, fill power, mummy vs quilt, and the weight-vs-warmth trade-off.
View guides →Pads
Sleeping pads compared on ASTM F3340 R-value, weight and type — air vs self-inflating vs closed-cell foam, by season. The cold pad ruins more nights than a thin bag.
View guides →By Temperature & Season
Building a sleep system by overnight low — 3-season, cold-weather and warm-weather bag+pad pairings. Home of the sleep-system matcher and warmth-to-weight comparator.
View guides →Accessories
The sleep-system accessory kit — liners for warmth and hygiene, pillows, compression and stuff sacks, groundsheets. What is worth carrying and what is dead weight.
View guides →The four guides most readers start with
Best backpacking sleeping bags
Bags compared on ISO rating, fill, fill power, weight and packed size — the cleanest path to a bag matched to your overnight low.
Best backpacking sleeping pads
Pads compared on R-value, weight, thickness and type — the half of the system that stops the cold ground stealing your warmth.
Best cold-weather sleeping bags
Winter and shoulder-season bags compared on ISO rating, fill and weight — for sub-zero and cold nights you can trust.
Best sleeping bag liners
Liners compared on material, warmth boost and weight — the cheapest way to add a few degrees and keep your bag clean.
By goal
Skip straight to the question you came here with. Each link drops you on the guide that answers it.
Who writes here
Warmth to Weight is founded and written by Theo Brandt, a backpacker in Bend, Oregon, who spends his cold-shoulder-season nights out across the Cascades. He started the site after one freezing, sleepless night taught him that a sleeping bag is only half of staying warm — the pad underneath is the other half, and the R-value nobody talks about is what saps the heat out of you. Guides also draw on rotating contributors — fellow backpackers and longtime thru-hikers. Product comparisons stay neutral and spec-led — no fabricated hands-on testing. Read more about how we work →