Odessa, thanks for the continuing tips on mailing. My F8 from hoppyfrog definitely wasn't too thick (ie. no zipper on the bag), but we do have to keep in mind that these are soft in the envelopes, not stiff like paper. I think that makes them much more prone to getting caught as they're rolled through the machines. Thankfully it wasn't significantly damaged and I still have 99.9% available to use.