Thank you, Mauro.
I wanted to include a follow-up with some detail for everyone’s benefit. I did some research with a clearbag.com company representative, and they assured me that there aren’t any traces of PVC in their “Crsytal Clear” food and photo boxes (they contain PolyEthylene TerePhthalate). You may be right, and this company may not truly understand archival quality and therefore may be overlooking PVC or acidic/additive traces – but I’ve questioned them several times and received the same answer. I am considering them for future artifact storage box purchases.
The dimensions are different from Gaylord or University products, but if that isn’t a problem, consider getting 25 boxes at $10, instead of $33!