The folding seems to be the main problem (in addition to even HD foil being very thin), and the corners are the worst. Wearing a tiny pinhole at a corner fold compromises the entire unit.

"If you had a pot to shape it over, why use the foil?"

The pot was just a handy, easily-available shape. He could have wrapped it around a hat, a rock or a volleyball to get the basic shape.

I don't usually carry foil, but if I did, I would roll it around a straw or lightstick or something.

Sue