Summer Bivy Idea? on the cheap?

I'm not 100% on the materials he uses but the tyvek/frogg toggs combination sounds similar to the uber bivy.

It's worth it to give it a try. However, i do have reservations in using the dri ducks frogg Toggs material as a dedicated bivy because of the fragility of the material. Throwing over a frogg Toggs poncho on top of your bag now and again when it's raining, is one thing, but often getting into and out of a bivy made with the material is another. But it's cheap enough that if it doesn't work out well, it's not too big of a loss beyond the extra waste (but i believe frogg toggs material can at least be recycled at many places?)

A 1443r tyvek which is softer a fairly breathable could be used for the top or for the whole thing if you bring a ground sheer.

Philip at sectionhiker.com used a 1443r tyvek bivy by Terra Rosa Gear on a BPL get together. He posted a review at
http://sectionhiker.com/tyvek-sleeping-bagquilt-cover-from-terra-rosa-gear/

Link to thread on using a Frogg toggs poncho as a bivy:
http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=21443

You could do the Frogg Toggs/Tyvek combo but…why do the extra step, just use all Tyvek, it's not like the combo would save you money. Plus, Tyvek is tried and true as bivvy material.

I made my Tyvek Bivvy for under $40, and most of that was just because of start up materials (big roll of Tyvek tape, super 77 spray etc).

The next Tyvek bivvy would cost me under $20.

I first tried using a Frogg Toggs poncho for a top material. Far too easy to tear. There are several different frogg Toggs fabrics and some are much heavier. Tyvek HomeWrap is 1.8 oz and the top I use is 2.3 oz. I have a simple 8 ft bag with these that weighs 11 oz. I also provide these to MYOG.

I have just about finished my bivy made from 1443r Tyvek.
Weighs 10oz with 38" zipper and large no see um net.
Will post picks later in week, still sewing zipper in.

I made a commodious bivvy from 1443 Tyvek using double sided seam tape to put it together. The Tyvek and seam tape were bought from Into the Wind, a kite shop in Boulder CO. It was sized to fit an Exped Synmat 7 LW. It weights 297 g or 10.5 oz.

I have used it a dozen times or so, and it seems to be holding up well. No zipper: instead, an overlapping flap 18" down from head end. I've used it on a calm night that got down to 8ºF, with an Enlightened Equipment Revelation 20 quilt under an MLD TrailStar tarp. My feet were getting cold toward dawn. Otherwise, it was comfortable.