The comfort rating, not the season name, describes your night · review
The only down bag in this group: it publishes a fill power, a down content, a shell denier and a comfort and limit pair — and still names no standard.
An envelope-shaped hooded down bag at 210 × 75 cm (82.7 × 29.5 in) in medium and 220 × 85 cm (86.6 × 33.5 in) in large, net weights of 760 g (26.8 oz) and 885 g (31.2 oz), a mesh storage bag and a compression sack, a fill of 85% down treated to be water-repellent, a comfortable temperature above 5 °C (41 °F), a limit temperature of 0 °C (0 °F), 20D nylon for both fabric and lining, a YKK zip that opens from inside and out, and a bottom zip for warm nights. The title carries 650FP.
650 fill power. That describes the down: a fixed mass of it lofts to 650 cubic inches. It is a quality measure, and a good one at this price.
And the fill weight is not published. Fill power without fill weight cannot tell you how warm the bag is. The listing gives the net weight of the whole bag — 760 g including shell, zip, hood and sack — which is not the same thing at all. Two bags at 650 fill power with different amounts of down inside will behave completely differently.
Above 5 °C (41 °F) comfortable, 0 °C (0 °F) limit. Two figures, correctly separated, and no standard named for either. Under EN 13537 or ISO 23537 they would come from a heated mannequin under fixed conditions — an indication rather than a promise. Here they are the maker’s own.
20D nylon on both faces is thin, which is how the bag reaches 760 g (26.8 oz). It is also what down needs: a tight, light weave that clusters cannot work their way through. The water-repellent treatment on the down itself is the other half of that answer, since damp down stops lofting.
Ask for the fill weight in grams. It is the one figure that would turn a good specification into a complete one, and any seller with the maker’s data sheet will have it.
The American Amazon store returned nothing, so the buy link opens a local search rather than a page that is not there.
Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.
A listing is not an offer: the reference exists on these stores, availability changes daily.
| Comfort rating | Above 5 °C (41 °F) — stated as the comfortable temperature; no standard is named, so it is an unstandardized figure |
|---|---|
| Limit rating | 0 °C (0 °F) — stated as the limit temperature; no standard is named, so it is an unstandardized figure |
| Standard quoted | None named — neither EN 13537 nor ISO 23537 appears in the listing |
| Fill power | 650 fill power — stated in the title |
| Fill weight | Not published on the listing — an 85% down content and a net bag weight are published, never the grams of down inside |
| Down or synthetic | Down — stated as an 85% down fill, treated to be water-repellent |
| Shell denier | 20D nylon — stated for both the outer fabric and the lining |
| Baffle construction | Not published on the listing |
| Packed size | Not published on the listing — a mesh storage bag and a compression sack are supplied, with no packed dimensions |
| Weight | 760 g (26.8 oz) in the medium size and 885 g (31.2 oz) in the large — stated as the net weight |
| Amazon reference | B08S2RVLL1 |
| EAN | 6927595774410 |
Fill power measures the volume a fixed mass of down lofts to — how good the down is. It says nothing about how much is in the bag. A 650 fill power bag with 200 g (7.1 oz) of down and one with 500 g (17.6 oz) are completely different products, and this listing publishes the quality and not the quantity.
The fill is 85% down cluster and the rest feather. Down clusters trap air; feathers add weight and quills. 85% is a normal figure at this price, and stating it is more than most listings do.
No. None named — neither EN 13537 nor ISO 23537 appears in the listing. What the listing does publish instead is the comfort rating: Above 5 °C (41 °F) — stated as the comfortable temperature; no standard is named, so it is an unstandardized figure.
8.4/ 10
The lightest and the best-specified bag of the nine on materials, and still missing the number that would make its fill power meaningful. For mild-weather backpacking at 760 g (26.8 oz) it is the obvious pick here; read the 0 °C (0 °F) as the maker’s figure, not a tested one.
Backpacking in mild conditions where 760 g (26.8 oz) and a 650 fill power down bag are the reason for the purchase.
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
Prices in these summaries were read on the dates each review gives. The live figure sits beside every product.
