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Minimum weight 1 lb 0 oz / 450 g
Packed weight 1 lb 2 oz / 510 g
Length 7 ft 4 in / 220 cm
Width at head 3 ft 0 in / 91 cm
Width at foot 1 ft 11 in / 58 cm
Sleeping capacity 1

Where to Buy

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Manufacturer's Description

MSR's AC-Bivy is one of the lightest bivies on the market.

* All-condition protection
* waterproof/breathable top
* DuraShieldil-coated floor
* Zippered mesh closure, allowing great ventilation while maintaining bug protection

Visit MSR's AC-Bivy page.

Retailers' Descriptions

Here's what other sites are saying:

When weight and space really count, the MSR AC Bivy is the best and most efficient way to get the all-condition protection you need. Maximum waterproof-breathable fabric coverage delivers the best possible breath-ability, while an extra-tough floor with our finest, 10,000mm DuraShield coating lets you rest confidently through anything. A zippered shoulder entry with mesh allows excellent bug-free ventilation and makes it easy to get into and use while sitting up.


The AC-Bivy from MSR is a super lightweight waterproof, breathable bivy that provides an all-condition refuge. Minimalists can have full-on, durable protection for a mere pound!


MSR AC - Bivy ShelterThe MSR AC - Bivy Shelter is perfect over night sleep gear that you will want to take for any outdoor trip you are planning to take. This sleeping bag only weights 450 g. / 1 lb. adding practically very little weight to your load. Next time you are going to sleep enjoy all the beautiful things nature has to offer you will be able to do it knowing that you will stay dry all night. It is made of waterproof - breathable fabric. MSR AC - Bivy Shelter consists of all-condition protection which means that you will be well ventilated all night but you won't have to suffer of any unwanted bugs inside the sleeping bag. Its 10,000 mm. DuraShield will give you the comfortable rest you will want on any extra-tough surface. Get your Bivy Shelter and you will be able to enjoy any overnight outdoor trip you decided to go to, no matter the weather conditions.

- SunnySports

No matter what the season, some prefer to go it alone in the mountains. And for minimalists of that mindset, MSR created the all-weather AC Bivy and outfitted it with a waterproof breathable top and a DuraShield-coated floor. Top and bottom protection from rain, sleet, snow, and wind is vital, but all is lost if you sweat to death during the first five minutes inside. To this end, the AC uses a zippered mesh closure that helps to vent some of that hot air out and away. Slide your sleeping bag inside this simple one-pound sack, and stay dry while you sleep off a long day of pounding trail or pulling rock.