ALTOS-S 20 Ultralight Mummy Bag




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 when carrying them, but 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 sustainable plant-based fill, vaulted footbox, zipper draft tubes and a 3-piece hood. Get the ALTOS-S Ultralight Sleeping Bag and step up your adventure.


-Sustainable plant-based fill
-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

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
Filler: Spectrum S

Storage & Conveniences

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

Works Great With

Elite Rainfly XT

$39.99 View

Cot Organizer

$17.99 View

ComfortLite™ Self Inflating Pillow

$17.99 View

Cot Under-Storage

$19.99 View

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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.

Don’t Throw It Out!

Equipment broken? No need to fill up landfills with your favorite gear. There’s a good chance we can help you get it fixed!

Ask A Question!

Having trouble with something? Just want to let us know how much fun you’re having? We want to hear it!