MSR E-Bivy - 2009 BCS

It isn't rated to any temperature at all. MSR best addresses this with saying: "a boost in warmth when pushing your bag’s temperature rating between seasons". Afterall, it's not insulated so how could it be rated? It's a thin layer of ripstop Nylon w/ 10K mm's of PU sprayed on it. It's super light and keeps the moisture of you, the rest is up to your sleeping bag.

TX-Direct Tent Proof would be the best bet, but it will need to be reapplied over time. Because the material is silnylon, a waterproofer will rub off much more frequently. The idea behind the E-Bivy is an emergency bivy for the 'just-in-case' moments. It does have a super durable floor and easy in and out via a side half zip. It breaths very well also. For light rain and colder nights in the desert regions this isn't a bad way to go.

At 208 cm long and 84 cm wide, It will fit most people.

This is a super simple bivy sac. It's really made for emergencies (thus the 'E' in E-Bivy stands for emergency). The outer material is super water resistant and breathable. The seams are not sealed so you might experience some leakage there if you're in a substantial rainstorm or downpour. There is a small zipper on the side for ease of entry and a flap of material that allows for more ventilation. It's a great bivy for the price and packs incredibly small.

!! This bivy is not waterproof !! The floor material is a waterproof, polyurethane coated nylon, but the top is only highly water-resistant sil-nylon. You and your sleeping bag will probably be waterlogged if you decide to use this as your primary shelter in a steady downpour. MSR describes it as able to "fend off dew, frost, light precipitation" as an emergency bivy -- "e-bivy".

Well this bivy is already waterproof, so go ahead if you want but it's not really necessary. All you're doing is adding weight and taking up space.

You are correct, no mesh. This bivy is meant to be used as an emergency bivy just in case things get bad. It is an excellent product that has a super durable floor (10,000mm coated 40D) and a highly water-resistant, breathable top. It's easy to get in and out due to the zipper-side access. It actually is a decent shelter if all you want is something to keep the occasional drops of moisture off of you while sleeping. For instance, in areas like the Grand Canyon where rain (at certain times of the year) is not that prevalent, this would be a great shelter option. It is also intended for times when you are caught in weather and need an emergecy shelter that's super fast to deploy. It isn't meant as a primary shelter for areas where a significant amount of rain is expected.

The floor is coated and fully waterproof to keep you dry even on wet ground. It uses a "40D x 238T ripstop nylon 6 10000mm polyurethane & DWR coated."

Pretty small. It actually is packaged in something resembling a small can of soup, but is impossible to get back in the bag (some, with about an hour's worth of effort have been able to, but it's not worth it man). However, there is a slightly larger bag included made for repackaging. The bivy itself is large enough to fit the fattest bags and is very water-resistant, but its really made for emergencies if your caught out with no shelter. It's not intended to be your only or main shelter however.The floor is also waterproof