Postal equipment has not sat still as far as what kind of
technology they employ over the time that Carolyn has
been sending seeds. Newer equipment could be harder on
them than what they were using 20 years ago or even
a decade ago.
I think just thicker foam should work, 1/8"-1/4" (at least that
is what I have been using, padding one side, simply because
I tend to have pieces of 3/32"-1/4" thick stuff sitting around
that came in a box of something).
Anyway, a bubble envelope will certainly do the job of
protecting seeds.
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