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

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:

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.


On Sale. Free Shipping. MSR AC-Bivy FEATURES of the MSR AC-Bivy Ultralight: Full protection for minimalists at just 1 lb / 0.45 g Waterproof: Two-layer, waterproof/breathable top with DuraShield coated floor All-Condition Protection: Zippered mesh closure allows maximum ventilation while maintaining bug protection SPECIFICATIONS of the MSR AC-Bivy Capacity: 1 Person Minimum Weight: 1 lb / 0.45 kg Package Weight: 1 lb 2 oz / 0.51 kg Dimension: 8 x 4in. / 20 x 10 cm This product can only be shipped within the United States. Please don't hate us.

- Moosejaw

If every gram truly counts, opt for the AC Bivy from MSR. A just a pound, this bivy promises huge savings in weight. While you trim weight, you won't be trimming protection, the DuraShield fly and floor protects you from the weather with a polyurethane coating and a DWR finish while a zippered shoulder entry with mesh provides ventilation and bug protection.

- Mountain Gear

MSR AC-Bivy Camping Bivy Sack - The MSR AC-Bivy Sack is the best and most efficient way to get the all-condition protection you need. Maximum waterproof-breathable fabric coverage delivers the best possible breathability, while an extra-tough 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. If you could only take one thing into the woods with you, make it the MSR AC-Bivy Sack.

- Outdoorplay