Maker’s warranty: Limited lifetime warranty against defects in materials or workmanship; covers original owner, bought from Sea to Summit or an authorized reseller; paid repairs; spare parts sold. Sea to Summit’s terms, read Oct 25, 2026
Sea to Summit’s own description.
Circuit Down Sleeping Bag Adapt to any adventure. The Circuit’s semi-tapered-rectangular shape fits you and fits your travelling, camping and backpacking lifestyle. Its extra width allows you to sleep on your side, wrapped in 650+fillpower down and soft-touch fabrics. As the weather warms, the wraparound zipper lets you ventilate the bag from top to bottom, and even open it as a fully flat quilt.
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
Weight and price against the sleeping bags & quilts rated 20°F to 40°F in the RidgeNote register with a published figure; other figures against every one of the sleeping bags & quilts. Manufacturer-listed; sources and dates are on this page.
The lightest of the sleeping bags & quilts rated 20°F to 40°F on record is Zpacks Solo Quilt at 11.8 oz — 565 g less.
Main models on the same shelf, compared with the Circuit Down Sleeping Bag on the makers’ published figures; the tick on each bar is the Circuit Down Sleeping Bag.
Zpacks
Solo Quilt
1.25 lb lighter (565 g)
Zpacks
Classic Sleeping Bag
1.22 lb lighter (553 g)
Western Mountaineering
Nanolite Top Quilt
1.17 lb lighter (530 g)
Not ranked: 11 with no published weight.
See all 25 →
Western Mountaineering
Versalite
rated 20°F warmer
0.2 oz heavier (5 g)
Western Mountaineering
Apache MF
rated 15°F warmer
0.2 oz heavier (5 g)
Western Mountaineering
Sycamore MF
rated 5°F warmer
0.2 oz heavier (5 g)
Not ranked: 9 with no published temperature rating.
See all 35 →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.
Sleeping bags rated 15 to 25°F ranked by maker-published weight: 21 models. Lightest: Therm-a-Rest Vesper 20°F/-6°C Down Quilt at 1.21 lb (550 g).
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.