Just made up the sewing sample for the all PTFE two person bivy.
Weight is 26 oz. Girth 106", length 76" (not including the 18" of height at the feet and
All black two layer PTFE laminate, the inside is the exposed PTFE film with no PU coating or glues
so will breath VERY well and is lighter than 2.5 or 3 layer. It is laminated to a 70d
ripstop nylon. Tho some of the film will scratch off with use, the scratches are generally not deep enough to effect waterproofness and the tradeoff for breathability and
weight reduction is worth it. This fabric will be many times more waterproof and windproof
than standard DWR materials like the Pertex Quantum R.
Cross chest zipper with strip of noseeum netting over the face so the bivy can be fully
zipped but still have plenty of air flow for breathing.
Will post pictures at my web site when they come back from the sewist.