Mummy Sleeping Bag

mtn dry down

Dual-Stage MTN-DRY™ Down

Not only is MTN-DRY™ hydrophobic, but in prolonged exposure to water the down features a rapid recovery for a dual stage drying.

compressible mummy bag

Compact & Light Weight

ALTOS down sleeping bags are made with packability and portability in mind. They are the smallest and lightest sleeping bags made by TETON Sports and build for the coldest temps.

Mtn_dry Down


ALTOS down sleeping bags feature a sustainable no-kill, no life-plucked, no force-feed documented duck down.

Lightweight, compressible, affordable

Built better than most other down sleeping bags, costs less than most high end synthetic sleeping bags

See what makes the ALTOS down sleeping bag the best down mummy bag on the market for your adventure. We've tested the ALTOS slepeing bags over and over in all types of situations, we have created one of the best down sleeping bags available.

Sustainable dual stage
MTN-DRY™ down

Repels and recovers for the best down sleeping bag yet

We spent two years taking hydrophobic technology to the next level, meet MTN-DRY™. A true dual-stage water repellant down and recovery once soaked, something normal hydrophobic down bags don't have. Put ALTOS to the test.

Find an ALTOS that matches your adventures.