Doc,Doc said:Kathmandu make excellent tarps in silnylon. They reckon that the smallest tarp that will keep you reliably dry is 2.5m x 1.5m. This is the one I have and it works fine as a ground basha. It weighs 300g (compared to 2kg for my tent).
I have used the tarp with a hammock but I would not trust it in wind and rain. Even the 2.7m aussie hootchi may be a bit marginal as a hammock tarp in bad weather. Some people have found the standard Hennesy fly to be a bit small too.
The Hex Fly is much bigger and, er, hexagonal, and I've not heard of anyone on the forum getting wet under one (though I'm happy to be corrected on this.)
Given I'm too big, old, fat and lazy for hammocks, I always use a ground basha (easier to get into and hard to fall out of too). That tarp sounds very interesting to combine with my bivi bag - do you have a link to a source with pics?
Red