s8tannorm wrote:Has anyone given any thought to just using a waterproof, breathable 'sheet' over the top of themselves rather than using a bag? Got to be lighter and quicker than using a bag.

FLV wrote:sounds like a pain to stop blowing away. or a pain to get under.

Under a tarp using just a waterproof, breathable sheet would work so long as your mats big enough to keep your bag off the ground, pegging it out loosely with some lightweight pegs would stop it sliding off you.
As an aside how much heat does a bivi bag contribute to warmth?