0°F Sleeping Bags (−18 °C, Limit)
Includes sleeping bags and quilts with a manufacturer limit (lower) rating between −21 °C and −15 °C (−6 to 5 °F) — both boundaries inclusive.
In the US, "0-degree" labels the limit rating, not warm sleeping: bags and quilts in this band typically carry a comfort rating of −9 to −12 °C (15 to 10 °F), and that is the temperature at which an average sleeper actually sleeps rather than shivers. Take one if your cold nights bottom out around −10 °C (14 °F) and you want reserve; if you really intend to sleep warm at 0 °F (−18 °C), you need the next class down — a limit of about −25 °C (−13 °F), sold in the US as a −10 °F bag.
71 models listed
Sorted: lightest first
How this selection is built
Every active sleeping bag or quilt qualifies when its manufacturer limit (lower) rating falls between −21 °C and −15 °C, both boundaries inclusive — a band of ±3 °F around 0 °F (−17.8 °C) that absorbs the rounding brands apply when converting between the two scales. Only the limit figure is filtered on; comfort and extreme ratings play no role in inclusion.
What's excluded — and why
Excluded: models with a limit above −15 °C (5 °F) or below −21 °C (−6 °F) — a −20 °F expedition bag is a different class, not a warmer version of this one — and models without a published limit rating, mostly cottage brands that quote a comfort figure only. Quilts are in on purpose: the lightest options at this rating are quilts, and leaving them out would cut the top off the list.
Why a 0 °F bag doesn’t sleep at 0 °F
American brands label bags by the limit rating, European brands by comfort — the same ISO 23537 test, two different numbers taken off it. A bag sold as a "0 °F" model has a limit of about −18 °C, and its comfort rating usually lands between −9 and −12 °C (15 to 10 °F). Limit means a cold-hardy adult curled up and getting through the night; comfort means relaxed sleep on your back. For a genuine 0 °F night in comfort you want a limit near −25 °C (−13 °F) — the class US shops call −10 °F.
The pad decides as much as the bag. Fill crushed under your body barely insulates, so a 0 °F bag on an R-3 pad performs like a −7 °C (20 °F) one; at these temperatures plan on R 5 or more, or stack a foam pad underneath.
Where the weight goes
At one and the same rating this list runs from 612 g to 2,479 g (21.6 oz to 5 lb 7 oz) — a fourfold spread, with the median around 1,330 g (2 lb 15 oz). The light end is 950 fill-power down quilts: Hammock Gear Premium Burrow 0 at 612 g, Enlightened Equipment Enigma 0 at 711 g. The heavy end is synthetic mummy bags at 2.1–2.5 kg, which cost roughly a third as much and keep their loft when damp. In between, moving from 850 to 950 fill power saves 65–80 g on the same model — a noticeable surcharge for well under a hundred grams, and that trade is what this whole class runs on.