||Tyvek Bivy Sack
Here we have my home-made bivy sack using Tyvek soft style 1443R (for Top panel), more durable/higher hydrostatic head Tyvek 1460C (for Base), no-see-um mesh and a one way non-separating coil zipper (all project materials available from Quest Outfitters). The project took maybe 3 hours to complete end-to-end (I work quite slowly and all seams are triple-stitched). Total weight for the finished article is slightly less than 7oz.
Soft Tyvek is a useful material for a bivy sack, it gives a good balance between durability, cost, water resistance and breathability. Initially it feels a bit like paper but after being scrunched-up into a ball it softens and feels like cotton. From some remnants of Tyvek I made a 0.6oz pillow case/stuff sack as it feels so comfy next to the skin.
If you would like to try making your own gear, soft Tyvek fabric is a good place to start. It is easy to handle, patterns can be marked-out accurately in pencil, it cuts well (edges dont fray) and seams are easy to sew as you can use the initial slight stiffness of the fabric to fold seams without the need to pin.
Ive used the bivy
multiple times now in the