I bought some note holders only a few days ago and have just now come across this thread.
I got the Uni-Safe brand acetate holders...are these OK? I would hope so, since I bought them from the Bay's coin section in Yorkdale mall; just thought I would check if acetate and mylar are equally safe (I suspect these are just two different words for the same material, but I can't find anything definitive on the web).
I'm a bit disappointed with these holders as the description says "Rigid, crystal-clear holders" and a pack of 10 was $4.75 + GST + PST, however they are not at all rigid - but as long as there is no PVC or other gunk that is going to leak out later, I guess I can make do with them for now.
As this thread refers to storage of notes, maybe this question I asked yesterday belongs under this thread: is it advisable to use silica packages when you are keeping your notes in a safety deposit box at the bank, or is silica unnecessary? Thanks!