I know that the one thing to avoid when it comes to plastic coin storage is PVC. I also have learned that often times, PVC containing products are very pliable and have a "shower curtain" small. A while back, I purchased some 2x2 holding coin pages from a dealer. The company was "Supersafe" and they had two different types. One was vinyl and the other was archival polyester. Someone told me the polyester was a better choice so I went with that (it was slightly more expensive too). The material is very rigid and thus does not have the characteristics one looks to avoid in PVC. Does anyone here have any knowledge about the difference and safety of vinyl verse polyester coin page?