ALTOS-S 20 Ultralight Mummy Bag


In stock

SKU: 1168


- Sustainable plant-based fill
- Lightweight
- Extra room in the footbox
- Anti-snag zippers
- Sturdy ripstop shell and soft liner
- Two sewn-in hanging loops for storage or to air dry
- Drawstring compression sack
- Lifetime Warranty


Step up your comfort. The ALTOS-S Ultralight Sleeping Bags are designed with you in mind. The water-resistant fill keeps you warm and comfortable. These bags provide more room for your shoulders, legs and feet.

Step up your features. The ALTOS-S Sleeping Bags are compact, environmentally friendly and so lofty when it’s time for bed. It’s a backpacker’s ultimate solution.

Step up your value. The ALTOS-S Sleeping Bags are not only warm, comfortable and easy to pack, they also have features you don’t usually see at this price, like a vaulted footbox, zipper draft tubes and a 3-piece hood. The ALTOS-S Ultralight Sleeping Bag will step up your adventure.

Specs and Sizing

Primary Features

Size: 84" x 32" (at the shoulders) x 17" (at the foot)
Pack Weight: 2.8 lbs.
Temperature Rating: +20˚F


Shell: 20D Ripstop
Liner: 20D Nylon
Fill: Dupont Sonora

Storage & Conveniences

Size (packed-not compressed): 12" x 8.75" x 8.75"
Storage: Oxford Stuff Sack with Drawstring Closure

Lifetime Warranty

TETON Sports has one of the best product guarantees in the business, made possible by our low defect rate and extra-mile customer service policy.

Customer Reviews

  • Rated 4.00 out of 5 based on 1 customer rating

    Based on 1 reviews

  • Mathew Montavon (verified owner)

    Firstly, I’ll say that I’ve yet to test it in the field. This is only my initial impression.

    First thing, the compression sack was surprisingly impressive. The material is thicker, with quality webbing and buckles. It would easily take a silicon impregnation type water repellant or stand up to being repurposed for other gear (handy, because I usually pack my bed and shelter in its own water tight bag). It easily takes the bag down to about 60% of its advertised pack width without trouble even after repacking it.

    Second, the bag itself seems solid. I love the extra room in the foot area, though it’s a bit snug in the shoulders. Though not tight enough to be problematic. I’m fairly average size, 5’10”, 160lb, with a 39″ chest. Other than that, it’s warmer than expected, the zips work extremely well, it packs very neatly, and should stand up to some heavy use.

    Will update later.

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