Was trying to find the same document protectors I previously used these are certainly very good protectors but not quite as good as the last batch I used from Staples. The ones I was looking for have a better "feel" and are completely transparent where these are slighlly les transparent. They work and work okay just wasn't what I really wanted. Unfortunately you cannot feel the protector or test it until you have purchased 50 or 100.
I share it with musicians - keyboard and vocalists. Having the music in sheet protectors (non-glare!) allows the page to lay flat on the music stands (piano too) easy to just flip one page at a time pages don't get tattered. Also print can fill the entire page no worry about 3-hole punch blocking something. Every (almost!) musician I have offered the sheet protectors to once tried has continued using them. Excellent use! It can also pages back-to-back and sometimes with extra notes in-between. Staples also sells Avery 5 Big Tab Insertable Pocket Plastic Dividers (#119020) - the tabs stick out beyond the sheet protectors.
These protectors are neither heavyweight nor really non-glare unfortunately but there aren't any available that I could find that are. They still are pretty shiny and reflective unlike some I had that I bought in the late eighties in another part of the country. They are also quite light-weight it seems to me. I am using them since I haven't found what I really want but I will keep looking.