The comfort rating, not the season name, describes your night · review
A roomier mummy bag offered in three temperature ratings and three sizes — and a listing that publishes neither the size you are buying nor what the fill is.
A Teton LEEF lightweight mummy sleeping bag with a compression sack included, in Fire & Slate, 20F.
TETON Sports states an ultralight bag designed for comfort without the bulk; a roomier mummy design allowing easy movement while packing down small with the included compression sack; efficient insulation and a compact design for a hiking backpack; a choice of 0 Degree, 20 Degree or 30 Degree ratings and three sizes; and that the bags are innovatively measured above and beyond the industry standard for maximum mobility while keeping a contoured fit.
No dimensions. No standard. No fill named. No fill weight. No denier. No baffles. No packed size.
The gap at the center of this page.
Three ratings — 0, 20 and 30 degree — and three sizes, and not a length, a width or a height limit among them.
“Measured above and beyond the industry standard” is a claim about the cut, not a figure. This shelf’s introduction explains why the figure matters: length, shoulder girth and foot box shape decide dead air, and dead air is what the rating assumes.
A roomier mummy is a bigger volume to heat at the same insulation.
Not named, not weighed.
The maker’s other bag in this group names microfibre and says what it is for — more loft, better compressibility. This one says efficient.
This shelf’s introduction splits this shelf on insulation first, and a bag whose fill is described by an adjective can only be judged on its temperature figure. That figure has no standard beside it.
The one real difference from its stablemate.
A stuff sack holds a bag loosely. A compression sack has straps that squeeze it further, which is what gets a synthetic bag into a rucksack.
The cost is that compression kills synthetic loft over time — which is why the maker’s other bag publishes hang loops and says not to store it compressed. This listing supplies the sack and does not repeat the advice.
Two 20-degree TETON mummy bags, side by side.
The TrailHead publishes a zipper draft tube, a roomy foot box, named microfibre insulation, and three pieces of care advice.
The LEEF publishes a compression sack, three ratings and three sizes, and is about 250 grams heavier by shipping weight.
TETON Sports’ instructions carry the sizing and the ratings. Nothing here replaces them, and nothing on this page describes any product as safe.
The American Amazon store was listing it at about $75 at the time of writing.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
Prices quoted in this text were read on October 8, 2026. The live price is at the top of the page.
| Comfort rating | Not published as a comfort figure. This variant is published as 20 F, with 0, 20 and 30 degree options offered |
|---|---|
| Limit rating | Not published |
| Standard quoted | None |
| Fill power | Not applicable — synthetic fill |
| Fill weight | Not published |
| Down or synthetic | Synthetic. The listing states efficient insulation without naming it |
| Shell denier | Not published |
| Baffle construction | Not published |
| Packed size | Not published. A compression sack is included, and the bag is stated to pack down small |
| Weight | Not published. The shipping weight is about 1.57 kg (3.5 lb) |
| Amazon reference | B09LMMMLP5 |
| EAN | 0817354015105 |
The listing does not say, and it does not dimension any of them. It states that three sizes and three temperature ratings — 0, 20 and 30 degree — are available, and that the bags are "innovatively measured above and beyond the industry standard to give you maximum mobility". That is a claim about the cut rather than a figure, and this shelf's introduction is clear why the figure matters: length, shoulder girth and foot box shape decide dead air, and dead air is what the rating assumes. A roomier mummy is a warmer bag to fill and a colder one at the same insulation.
On the page, it publishes less. Both are 20-degree TETON mummy bags with no standard quoted and no dimensions; the TrailHead adds a zipper draft tube, a roomy foot box, named microfibre insulation and three pieces of care advice — stuff rather than roll, hang in storage, use an insulated pad. The LEEF adds a compression sack instead of a stuff sack, which packs a synthetic bag smaller, and the choice of three ratings and three sizes. It is also about 250 grams heavier by shipping weight.
How small the bag goes, and how long it stays lofty. A stuff sack holds a bag loosely; a compression sack has straps that squeeze it further, which is what gets a synthetic bag into a rucksack at all. The cost is that compression is what kills synthetic loft over time, which is why the maker’s other bag in this group publishes hang loops and tells you not to store it compressed. This listing supplies the sack and does not repeat that advice.
Close prices, same category: comparable camping gear. We keep only the specifications all of them publish, because a column with gaps compares nothing.
| Model | Price | Comfort rating | Down or synthetic | Shell denier | Baffle construction |
|---|---|---|---|---|---|
| TETON Sports LEEF mummy bag, 20 F | $75 | Not published as a comfort figure. This variant is published as 20 F, with 0, 20 and 30 degree options offered | Synthetic. The listing states efficient insulation without naming it | Not published | Not published |
| TETON Sports 1022 TrailHead mummy bag | $65 | Not published as a comfort figure. The bag is published as a 20 degree bag | Synthetic: innovative microfibre insulation, stated to offer more loft and compressibility | Not published. A soft-to-the-touch liner is stated | A zipper draft tube, stated, with a roomy foot box |
| Coleman North Rim mummy bag, 0 °F | $94 | Not published as a comfort figure. The bag is published as warm in temperatures as low as 0 °F | Synthetic: Coletherm hollow polyester insulation, named, stated for heat retention with less weight | Not published. A polyester ripstop cover and a polyester lining are stated | A Thermolock full-length draft tube along the zip, a special quilting construction stated to eliminate potential cold spots, and a box-shaped foot |
| VENTURE 4TH V4-02-XXL three-season bag | $55 | Not published as a comfort figure. The bag is published as comfortable in temperatures from 30 to 70 °F | Synthetic. High-grade polyester is named for the construction; the fill is not named separately | Not published. The shell is stated water-resistant and machine washable | Not published. A two-way zip and a breathable design are stated for airflow |
A buyer choosing from the range rather than from the page
Amazon reports what buyers took in the month before this page was last checked: at least 50.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for camping and hiking gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
Mummy · 400 GSM synthetic · comfort +4 °C (39 °F) and limit -2 °C (28 °F) stated · 1.55 kg (3.4 lb) total · compression sack · no standard named
The only bag here to publish a comfort and a limit figure separately — and, like every other bag in this group, it names no standard behind them.
Best for: Three-season camping where a stated comfort and limit pair matters more than a published packed size.
Mummy · 300 GSM cotton and hollow-fiber fill · comfort 15 °C (59 °F) to 20 °C (68 °F) · about 1300 g (45.9 oz) · 35 × 25 cm (13.8 × 9.8 in) packed
A three-season mummy bag that publishes weight, packed size and fill density, and puts its comfort range at 15 °C (59 °F) to 20 °C (68 °F) with no standard behind it.
Best for: Spring to autumn trips where about 1300 g (45.9 oz) into a 35 × 25 cm (13.8 × 9.8 in) roll is the constraint that matters.
20 °F, no standard · 82 × 33 in · polyester shell, brushed tricot liner · no-snag zip
Five bullets, five facts and no padding: a 20 °F mummy bag of 82 by 33 inches with a drawstring hood, a brushed tricot liner and an anti-snag zip with contrasting webbing.
Best for: A straightforward cold-weather mummy bag with nothing to decode
≈ $43
