Sea to Summit
Alpine Down Sleeping Bag
Sold by the people who make it — no third-party seller in between.
Manufacturer list price (MSRP)
$934.00
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Overview
Alpine Down Sleeping Bag Gear up for your next high altitude or colder latitude adventure with the Alpine Down Sleeping Bag. The expedition mummy fit provides ample space for winter gear, while the modified Free-Flow Zip system provides ventilation and versatility. Complex construction throughout and 850+ fillpower, RDS-certified non-PFAS Ultra-Dry Goose Down delivers maximum warmth retention.
Specs
- Brand
- Sea to Summit
- Weight
- 1562 g · 55.1 oz
- Temp rating
- -20 °f | -29 °c (ISO 23537, tested by Sea to Summit)
- Fill
- rds certified, 850+ fillpower goose down with a non-pfc ultra-dry down treatment
- Shape
- Mummy
Weight vs. category
55% heavier than the category average.
How it measures up
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.
- Weight
- 3.44 lb (1562 g)
- Lighter than 15% of 26 weighed · #22 lightest
- +46% vs the median 2.36 lb
- Price
- $934.00
- Cheaper than 0% of 22 priced · #22 cheapest
- +151% vs the median $371.98 · $16.95/oz (median $8.20/oz)
- Temperature rating
- -20 °F
- Lower than 94% of 49 rated
- median 20 °F
The lightest of the sleeping bags & quilts on record is Gossamer Gear Cumulus x Gossamer Gear Aerial 330 Sleeping Bag at 11.6 oz — 1233 g less and $535.00 less.
The cheapest is Sea to Summit Boab Synthetic Sleeping Bag at $124.00 — $810.00 less and 252 g lighter.
RidgeNote verdict
Similar — lighter or cheaper
Compared with
Side by side on weight, list price and cost per ounce.
Related reading
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What Is the Lightest 20 Degree Sleeping Bag in 2026?
The lightest 20 degree sleeping bags for 2026, ranked by weight, price, and price per ounce, from 800 g to 2041 g across eight models.
Manufacturer list price (MSRP)
$934.00