Hi Twinmike
you said, = "Here we are just going into a two plus feet of snow storm and it would be a good time to test out some ideas. Have you tried to use a solar blanket on top and on bottom of the sleeping bag."

Solar blankets are generally very air tight sort of things. One time a very long time ago I put a space blanket over my sleeping bag and it was soaking wet from the inside when I got up. Sleeping bags need to breath to eliminate your persperation. If you are experimenting with these space blankets for the purpose of extending summer gear into the winter, you are on a fools errand.

You can extend summer down bags by putting one inside of another. Only its ugly if you toss and turn a lot. You get sort of a panty wad going.

Priorities: mine of course.
1) Durable - no valve that can fail or rip out - materials.
2) Thickness - ability to "float" in it
3) insulation value - good for winter - down?
4) easy to fill in a tent in a storm
5) large enough to use as a major summer floatation device which will keep me high and dry above a cold lake.
6) weight
7) cost