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I've got my army basha that I used when I was in the army reserves, and I was fine in that, even in heavy rain, if I had it set up as an A Frame. I'd set it up so one end was against a tree, and blocked the other end with my Bergan. Kept me dry enough.
As long as you don't mind having very little space to manoeuver, a bivi is the perfect shelter IMO.
I reckon I'll get one of those myself. I didn't know they existed.