Here is a trick with the Thermo-lite bivy you might
want to try. It works especially well with the Hennessy but works just as well
in a tent or tarp. I first removed all the factory installed Velcro strips from
the bivy. I then turned it inside out and sewed the opening side shut all
the way to the top. I then made a cut down the center of the bevy to about 16
inches from the bottom end. I finished the
cut on both sides with 1 inch taffeta webbing folded over the cut edge. I added
two 3/4 inch web pieces about 8 inches long to one side of the cut, one at
18 inches and the other at 36 inches. To make these straps work with the
Thermo-lite I sewed four pieces of 1 inch webbing, two sets opposite of each
other at the 18 and 36 inch points. I sewed them using a fairly wide zig-zag
stitch running down each of the out side edges. I then sewed two pieces of 3/4
inch loop side Velcro to one side and the 8 inch web strips, with 3/4 inch hook
side Velcro sew to most of it's length, on the opposite side. I left a tab about
1 inch long on the "unsewn" end of the 1 inch webbing to act as a handle for
opening the Velcro. If done properly, when you pull the strap off the Velcro
retainer you'll be pulling on the 1 inch webbing on both sides and not on the
I added the straps to accomplish 3 goals. The first
was to provide much easier entry and closure than the side opening provided. The
second was to provide some adjustably to the bevy to allow a thick pad and
winter bag to fit inside with out compressing the loft of the bag. The last, but
certainly not least, goal was to provide better ventilation in the bivy to stop
condensation on the inside of the Thermo-lite, which went right back into the
bag. The strap arrangement allowed adjustable gaps in the Thermo-lite material
on the top of the bag making venting much more successful. Limited testing (I've
got a killer flu) indicates that all three goals were accomplished.
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