Phat: I was thinking about this one: Integral Designs Siltarp 2. Backcountry.com is out of stock, but Amazon has it for $135 and change, plus shipping. This is the sort of thing I'd take if hanging were not an option, or if setting up a base camp, or with the family trip I outlined above. The price is way beyond what I thought I wanted to spend, but from what I can see it may be worth it. I'll be looking around some more before I jump.
You can probably find other 8x10 silicone tarps cheaper.
For that price you could buy two silponchos, and tie them together when you want the family size tarp, or use them individually (and multi-use) when you go smaller
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