Maker’s warranty: Manufacturing defects, within one year, within the United States; covers the purchaser; discounted third-party repair (Rugged Thread). Gossamer Gear’s terms, read Oct 25, 2026
A limited-edition mummy bag made by Cumulus for Gossamer Gear, rated to 30°F, with 11.6 oz (329 g) of 900-fill goose down and Toray Airtastic fabric. It has no zip and no down on the base, leaving the sleeping pad to insulate underneath; Gossamer Gear lists it at 17 oz.
Figures with a source link to the page they were read from, with the date we checked it.How we get these figures →Wrong figure? Tell us
Against every one of the sleeping bags & quilts in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
Main models on the same shelf, compared with the Cumulus Aerial 330 Sleeping Bag on the makers’ published figures; the tick on each bar is the Cumulus Aerial 330 Sleeping Bag.
Therm-a-Rest
Vesper 32°F/0°C Down Quilt
1.5 oz lighter (42 g)
about the same list price
Hyperlite Mountain Gear
40-Degree Quilt
2.6 oz lighter (74 g)
$31 more
Sea to Summit
Spark Women's Down Sleeping Bag
3.5 oz lighter (100 g)
$50 less
Not ranked: 25 with no published weight.
See all 8 →Sea to Summit
Spark Women's Down Sleeping Bag
$50 less
3.5 oz lighter (100 g)
Kelty
Cosmic Down 20 Sleeping Bag
$209 less
1.38 lb heavier (624 g)
Sea to Summit
Trek Down Sleeping Bag
$35 less
1.40 lb heavier (637 g)
Not ranked: 59 with no published list price.
See all 10 →Sleeping bags rated 15 to 25°F ranked by maker-published weight: 22 models. Lightest: Therm-a-Rest Vesper 20°F/-6°C Down Quilt at 1.21 lb (550 g).
Sleeping bags and quilts rated 26 to 35°F ranked by maker-published weight: 16 models. Lightest: Zpacks Solo Quilt at 11.8 oz (335 g). Median 1.39 lb.
How to read a temperature rating, why fill weight matters more than fill power, per-size prices, and what the makers publish for the Kelty Cosmic 20, the Western Mountaineering line, NEMO, Sea to Summit, Mountain Hardwear and Therm-a-Rest.