I use these for genealogy files and they work just fine As I said they're slippery but once in the binder that's no problem. I'll be back for more lots more.
After getting the kids award binders up to date I just added about 20 extra page protectors to make it easy to KEEP the binder up to date. Now as the team picture and certificates come in I can just slide them in the page protectors in order and move on.