I finished the first of my test tarp today. Probably three hours put into this. This includes lots of test pieces for tie out points that were tested to destruction.
Its made from uber light weight ripstop spinnaker material, apparently original cost is £75 per square metre.
It's a basic rectangle approx 8ft long and 5ft wide give or take. All of the hems are triple rolled and tie out points have four layers of re-enforcement. Thread is 100% polyester gutterman thread. Tie out points are black 1" grosgrain.
With a total of 8 guys and line locks plus an Alpkit silnylon stuff sack it comes in at 157g!!!! Its really small and can even compress further than shown in the pics.
There are already a couple of things I'd change. I tested which side the tie outs should be attached to. Four were done underneath and four above. It looks like atheistically, putting them on top is the way to go.
Enough talk here's the pics.
More pics - www.bikeandbivi.co.uk