Why are there different NSN Options? Over the years, different government contractors have produced these items under different NSN numbers. Rest assured these are all the exact same product, they just have different part numbers. You can select and purchase any option that shows in-stock.
The Waterproof Gore-Tex IMSS Bivy Cover is a must have for those long wet nights. The Bivy provides an added barrier to your sleeping system to prevent water from reaching your sleeping bag. The lightweight, but rugged design allows for easy storage and won't add addition unwanted weight on those long trips. A component of the Improved Modular Sleep System or IMSS, the Bivy is designed to cover the Patrol and Intermediate Cold Weather sleeping bags and fit into the compression stuff sack (available separately).
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