Originally Posted by PatriceJ

there'd be no point in trying to sell them in the QB Thrift Shop.
we cannot sell here for profit - even if our stated personal intent is to donate those profits to charity.

given their apparent size, you are spending much more than necessary if you're paying $20 or more postage.
you could fit at least two or three of those into one padded flat rate envelope.
unless they're stuffed with something heavy, rather than poly-fil, even flat rate might be more postage than necessary.