I was looking at hooped bug bivies and wondered….
It would be interesting to have a tunnel style bug bivy that could use a poncho tarp for the fly, making an "instant" double wall tent with floor and bug protection. I'm thinking something with just enough room to sleep on your side or tuck your knees up a bit. The poncho could be simply guyed and staked over the framework provided by the bug bivy. The bivy could be used without the fly for "stargazer" nights.
It might be possible to put pole sleeves in a poncho and have a mating bathtub floor with grommets for the poles for a no bug option, just fly and floor.
For example, a GoLite poncho is 58"x104". The diameter of a circle with a 116" circumference (2×58") is a little over 36" (116/3.14=36.94). That would give a 36" floor width if the poncho was wrapped tight in a half circle. That would only give an 18" peak height which would be okay at the foot end, but it could use more like 30" at the top. You could flare the sides out and raise the head-end peak height, providing some ventilation at the same time. The bathtub sides could be made taller to help close the gap. A foot end panel could be added to the floor section to add weather protection, assuming the "roof" would overlap the end section. The same is possible for the head end, with an eye to ventilation for both. A trapezoidal shaped poncho might work too, with the wider part of the trapezoid over your back and pack when worn. The length could be adjustable in the usual manner for ponchos with a fold-up-and-snap section in the rear.
I just mocked it up with a 3/16" scale model and printing paper. The small wire is 36" long to scale and the white footprint is about the same as my GoLite Utopia 1 floor– 30" x 96". The front "pole" is 2' longer than the width of the poncho. Scale dimensions work out to 36" tall x 50" wide at the head end and 20" tall x 36" wide at the foot end.


The mock up represents size and an approximation of what a poncho with pole sleeves in the hem would look like. An inner bug bivy with poles would "webs" between the fabric and pole sleeves to create some space between. Add some Velcro loops to hold the poncho to the poles. The poles should move inside proportionate to the amount of overlap desired. The model shows a 96" (8') footprint. I'd like just a little more length on the poncho, although beaks are possible too.





