Researched comparisonLast updated September 2026 · How we review
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Quick Answer
The Coleman Heritage Big & Tall at $101.99 is the cheapest and warmest on paper at 10°F, but it weighs 8.9 pounds, so it is for car camping. The Marmot Trestles 15 ($139) is the lightweight synthetic pick at 3.38 pounds. The Kelty Cosmic 20 Down ($189.95) is the packable down option, and the North Face Stormbreak 20F ($160) is a 20°F synthetic bag that comes in short, regular, and long.
- Kelty Cosmic 20 Down: best for backpackers who want 550 fill power down at 20°F in 2 lb 7 oz.
- Marmot Trestles 15: best for buyers who want a 15°F synthetic bag with SpiraFil insulation and a limited lifetime warranty.
- The North Face Stormbreak 20F: best for buyers who want a 20°F synthetic bag in three lengths (72, 78 or 84 in).
- Coleman Heritage Big and Tall: best for car campers who want the lowest temperature limit here (10°F) in a roomy 40 × 84 in rectangular bag and don’t mind 8.9 lb.
Prices as of September 30, 2026, 6:27 pm CT.
Choosing a sleeping bag comes down to temperature rating, insulation type, weight, and size, and those trade off against each other and against price. This comparison covers one cold weather bag each from Kelty, Marmot, The North Face, and Coleman, rated between 10°F and 20°F, so you can see how a down bag, two synthetic bags, and a heavy flannel car camping bag differ.
How We Chose
We picked four established camping brands that sell a bag rated between 10°F and 20°F on Amazon. These bags are not the same type: the Kelty is down, the Marmot and North Face are synthetic, and the Coleman is a large flannel bag meant for car camping, so this is a comparison of options and not a like for like ranking. We compared price, temperature rating, fill, weight, and size from the manufacturer product page where we could read one and from the Amazon listing otherwise. The North Face, Kelty and Marmot pages supplied their specs, except the Marmot length, which is not on its page. We could not read a product page for the Coleman bag, so its specs come from the Amazon listing and say so in the table. Temperature ratings are the manufacturers’ numbers, and comfort varies from person to person. This is a researched comparison, not a hands-on test of these bags, so the comparison rests on manufacturer specifications and Amazon listing details. The Marmot, North Face, Coleman and Kelty are all available on Amazon. We dropped the Big Agnes Echo Park because it was only available from a third-party seller when we checked. Prices are Amazon prices checked in September 2026 and can change. The warranty column comes from each manufacturer’s own website, checked in September 2026. Where a manufacturer page covers a product line and does not name the model, or gives no length, the cell says so, and terms can differ by size or color, so confirm before you buy.
The Lineup
Prices as of September 30, 2026, 6:27 pm CT. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Amazon may show a different seller than the brand or Amazon.com. Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.
Kelty Cosmic 20 Down
$189.95 as of Sep 30, 2026, 6:27 pm CT on Amazon · packable down, 20°F
Best for: backpackers who want 550 fill power down at 20°F in 2 lb 7 oz.
The Cosmic 20 is a long running Kelty backpacking bag. This version uses 550 fill power RDS certified down, a recycled 20D nylon shell, a recycled polyester liner, and a PFAS-free water repellent finish. Kelty’s product page lists the Regular size at 2 lb 7 oz and 78 inches long, with a semi-rectangular shape, a 20°F rating and 550 fill down. It is available on Amazon.
Check Price on Amazon →Marmot Trestles 15
$139.00 as of Sep 30, 2026, 6:27 pm CT on Amazon · lightweight synthetic, 15°F
Best for: buyers who want a 15°F synthetic bag with SpiraFil insulation and a limited lifetime warranty.
The Trestles 15 is a synthetic mummy bag with SpiraFil high loft insulation that Marmot says keeps you warm in wet weather. Marmot’s page lists 3 lb 6.1 oz and a 62 inch shoulder girth, the listing gives 72 inches long, and this listing is the regular size with a left zip. It weighs about the same as the Stormbreak’s regular size and more than the Kelty. It is available on Amazon.
Check Price on Amazon →The North Face Stormbreak 20F
$160.00 as of Sep 30, 2026, 6:27 pm CT on Amazon · synthetic, three lengths
Best for: buyers who want a 20°F synthetic bag in three lengths (72, 78 or 84 in).
The Stormbreak is a 20°F synthetic bag. The listing describes Heatseeker Pro insulation made with 85 percent recycled content, a recycled polyester body with a non-PFC water repellent finish, soft vertical quilting for stretch in the lower leg area, a full length two way center zip, and a compression stuffsack. It comes in short, regular, and long, listed at 3 pounds 2 ounces, 3 pounds 6 ounces, and 3 pounds 11 ounces on The North Face product page, which gives lengths of 72, 78 and 84 inches, and the listing gives maximum user heights of 5 feet 6 inches, 6 feet, and 6 feet 6 inches. It is available on Amazon.
Check Price on Amazon →Coleman Heritage Big & Tall 10°F Flannel
$101.99 as of Sep 30, 2026, 6:27 pm CT on Amazon · warmest rating, heavy
Best for: car campers who want the lowest temperature limit here (10°F) in a roomy 40 × 84 in rectangular bag and don’t mind 8.9 lb.
Coleman’s Heritage bag is a rectangular flannel bag sized 40 by 84 inches to fit adults up to 6 feet 7 inches. It is filled with 5 pounds of Holofill 808 insulation, has a cotton shell, a no-snag zipper, and is machine washable. It is rated to 10°F and weighs about 8.9 pounds, so it is a car camping bag, not a backpacking bag. It is the cheapest here. It is available on Amazon.
Check Price on Amazon →Our Take
For car camping on a budget, the Coleman Heritage Big & Tall is hard to beat on price and roominess. If you carry your gear, the Marmot Trestles is the lightweight synthetic pick and the Kelty Cosmic Down is the packable down option. The North Face Stormbreak is a 20°F synthetic option that comes in three lengths.
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Frequently Asked Questions
What does the temperature rating on a sleeping bag mean?
It is the lowest temperature at which the manufacturer says the bag will keep an average sleeper alive or comfortable, depending on the standard used. Many people choose a bag rated 10 to 15 degrees below the coldest night they expect.
Is down or synthetic insulation better?
Down is lighter and packs smaller but loses insulation when wet and costs more. Synthetic insulates better when damp and is cheaper but heavier and bulkier.
Do I need a sleeping pad with my bag?
Yes. The ground draws heat out of your body, and a pad insulates you from it.
How do I wash a sleeping bag?
Follow the care label. The Coleman listing says its bag is machine washable, and down bags like the Kelty usually need a gentle wash with a down specific cleaner.
