I use these for music. My instructor my accompanist and I all think they are wonderful The two professionals had never heard of them before. They allow you to see music in all kinds of conditions.
They do the job but could be a little thinner to save weight when you have a notebook full of them. Biggest complaint is some are hard to open and they're so tight it's difficult to slide a sheet inside.
Paid a premium price for what is a very good quality sheet protector. When I put together a notebook for clients I put a lot of thought into matching inserts the cover design etc. The BOLD STAPLES LOGO ON THE EDGE EVERY SHEET PROTECTOR PAGE RUINS THE ENTIRE LOOK OF MY CLIENT NOTEBOOK. If I had known that would be there I never would have purchased this item.