In reply to Keiran.A:
thanks for the input guys. i have used a tarp on summit camps but i wanted to ditch the pegs and pitching. my bivis fully waterproof and encapsulating so sleeping inside it during rain isn't a problem, it was just the getting inside part.
one of the advantages of bivi bags is being able to sleep practically anywhere. So although natural shelter will make it more comfortable, i wanted to remove it as a neccesity.
tarp and bivy combo is a great setup, even if its a micro tarp thats only big enough to cover your head area and maybe some cooking space but i wanted advise for if i was using my bivi as the only form of rain shelter I'm my sleeping system.
otherwise I'm thing of something super lite, that doesn't need to be full proofed, that i can use as "throw" whilst I'm transitioning from walking to sleeping. this would also double as the dryish bag for my pack (have my pack, boots etc wrapped in it during the night) e.g. tyvek
Post edited at 17:21