Dave, I totally agree and if I was using just an open bivi bag I probably would have gone with a bigger size but my bivi is the snugpak stratosphere so I'm fully enclosed when inside.
The main reason I want a tarp is to give a bit of admin space and storage in bad weather as the stratosphere (as comfy as it is) has buggered all space to do anything in once zipped up.
I suppose what I'm trying to say is that the the pack size was the defining factor (though you pay for that smaller packet) as it's only to provide additional shelter and not my primary way of staying dry.
That said I have a dd hammock and 3x3 tarp for when I'm hanging and the kit is great and wouldn't knock them.
Hamster
