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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
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! Top material uses a waterproof, breathable coating bonded to a tough yet lightweight ripstop nylon. Durashield(TM) polyurethane coating provides incredible waterproofness on the exceptionally durable nylon floor. Factory tape seam sealing provides absolute in waterproofness and out-of-the-store readiness. Envelope-style opening overlaps to provide a lightweight and simple entry; zippered mesh panel at the top end provides insect protection. 3D footbox provides ample room for campers with large feet, and comfort for everyone. Stash up to a medium-size pack in the hood area while you are inside; opening is situated to fit where your face is with the pack at the head for easy access. AC-Bivy fits you, your sleeping bag/pad and your pack!