I have made MANY of these "Click-It" bags and have had no problems with them rubbing through the fabric. Perhaps that's due to the fact that I have enlisted DH to help. He cuts the ruler to my specified length, then rounds the edges with his wire clippers (I think) and files them for me. This makes him very proud to be a part of the process and be involved with the gifting of these to our friends. I use the () method of inserting them in the bags, and while they do not make a loud clicking sound, I have found that they do stay tightly closed after many openings. I have been making and using them for several years.
These can be made in varying sizes for many uses, i.e., cosmetic bag, crayon/pencil bag, loose change/band aid/sterile hand wipe bags. They make great gifts and are quick to make.