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The Brooks-Range Alpini Bivy Sack is an ultra-light, single-person shelter made from ultra-lite 20-denier ripstop waterproof / breathable material that Brooks-Range has specifically designed and manufactured. The floor is made of ripstop nylon and is coated to be extra durable. A short side zipper makes set-up and getting in and out a breeze. The Alpini Bivy also has an extra deep cowl-cover (essentially an oversized hood) to keep you protected from the elements.
Read the full report here.
I think that sums it up pretty well, for example you would not want to rely on the Alpini Bivy in a downpour of rain as it is not 100% water proof. We tested the top fabric in a rain simulation and it beaded but ultimately water got through and the sleeping bad ended up getting wet, the bottom of the bivy is water proof though. As well, you would likely not want to go on a month long adventure with this being your retreat each night (you would not want to do that with any bivy sack though) as it does not have a pole to keep the hood off of your face and can feel restrictive to those not used to bivy sacks.
The Alpini bivy does excel at being a very compact and light weight bivy for use on summit bids, emergency situations and alpine specific trips. I am not sure any one bivy sack would work in every situation - I guess that is the same reason we have multiple skis in the quiver?
