I was in a quilt shop that put the patterns and books in separate sealed clear plastic and it was sealed with heat all the way around. One book of each was left not sealed for the store copy so everyone could look inside. No way a pattern could be returned and it not be noticed it was opened. The owner said she paid her teen son to seal the bags using a food saver. This keeps customers happy to be able to return items when they get home and find they have duplicates. That happens a lot.