About Warmth to Weight
Warmth to Weight is an independent buyer-guide site for backpackers. "Warmth to weight" is the backpacker's core metric — the most warmth for the least carried grams — and the whole mission here is getting you to that balance instead of either freezing on the trail or hauling a heavier pack than you need. Too many first-timers buy a bag on its headline number, pair it with a thin pad, and spend a cold, sleepless night wondering what went wrong. This site exists so that doesn't happen to you.
Sleep warm. Carry less. We help you match the bag and the pad to do exactly that.
What we do, in plain English
We gather the specs of the sleeping bags, quilts, pads and accessories worth knowing about — ISO 23537 Comfort and Limit temperature ratings, ASTM F3340 R-value, down vs synthetic fill, fill power, packed weight and size, dimensions — and we organise them: by what you actually need for your overnight low, by season, by budget. Then we publish the spec-led comparisons that should already exist but somehow don't. We update our top picks regularly, and we don't accept payment to position a product.
When we have a strong, honest view — down versus synthetic, quilt versus mummy bag, Comfort versus Limit rating, air versus foam pad — we say so and explain why. When the right answer depends on your conditions, your sleep style and how light you want to go, we walk through the decision instead of pretending there's one universal pick.
Our editorial method
- Source the specs. ISO 23537 Comfort/Limit ratings, ASTM F3340 R-value, fill type and fill power, packed weight and size, dimensions — straight from manufacturer listings and current retailer product pages.
- Run the comparison. We line products up on the specs that decide how warm and how light they actually are, not the ones that sound impressive on the box.
- Land the recommendation. Specific, season-aware, and updated whenever the product line changes. Warmth-to-weight figures are derived from published rating and packed-weight specs.
When a bag or pad gets discontinued, we mark the page as updated and swap in the closest currently-available replacement. We don't pretend a dead link still works.
Who writes here
Theo Brandt founded Warmth to Weight and writes the blog himself. He's a backpacker in his late 30s, based in Bend, Oregon — real cold-shoulder-season country on the edge of the Cascades, with an active trail community nearby. He's a weekend backpacker who grew into longer cold-shoulder-season trips, carrying a down quilt as his 3-season workhorse, a synthetic bag for wet nights, and an insulated air pad he chose for its R-value after the night that taught him the lesson. He knows the gear from years of real trail use, not a lab.
The honest origin story: early on, Theo bought a bag marked "rated to 20°F" and, to save money, paired it with a cheap, thin summer sleeping pad with a low R-value. On a clear, cold night on hard ground he froze through the entire night and barely slept — and couldn't understand why, because the bag was "rated" for the temperature. He learned the hard way that the cold ground was pulling the heat straight out of him through the under-insulated pad: warmth is the bag AND the pad as a system, and R-value is the spec most first-timers ignore. He also learned that the bag's optimistic number was a Limit rating, not a Comfort rating. That night — warmth where it counts, weight where it doesn't — is the origin of Warmth to Weight.
Theo is an active member of his local backpacking community — the friend others text before a trip to ask what bag-and-pad combo they need for the forecast low. He writes as an experienced backpacker and site founder, not a guide, instructor or gear engineer, and that boundary is deliberate. Where a first-person observation is genuine, from his own trips, he says so. Some articles also come from rotating contributors — fellow backpackers and longtime thru-hikers. Each article shows its author at the top; when someone else writes, Theo's name appears at the bottom under "Edited by".
What we don't do
- We don't claim hands-on testing we didn't do. Product comparisons are pure spec aggregation from verifiable manufacturer details and listings — not because we have lab-tested every bag and pad in every guide. We never claim to have measured a specific product's true R-value or temperature performance. Where a first-person note is genuine, from Theo's own gear, we say so explicitly.
- We don't soften cold-weather safety. Ratings are lab figures and real-world warmth varies; we never frame any rating as a survival or safety guarantee.
- We don't chase headline numbers. We'll tell you that a "rated to" figure is often the optimistic Limit rating, and that the cold pad ruins more nights than a thin bag does.
How we make money
Warmth to Weight is a participant in the Amazon Services LLC Associates Program. If you buy something via a link on this site, we earn a small commission. It costs you nothing.
We don't tilt our recommendations to favour any single product, brand, or commission tier. You can read the full disclosure on our Amazon Disclosure page.
How to reach us
Tips, corrections, product launches we should know about, or just a hello — write to hello@warmthtoweight.com or use the contact form. We read everything. We can't respond to every message, but we read.
If you spot an outdated spec, a discontinued product, or a price that's drifted, those tip-offs are especially welcome. They keep the site honest.