I purchased a box of 50 of these sheet protectors because I am putting together binders of some very old original historical documents and photos that can't be replaced. A few surviving family cousins are interested in our of family ancestry. Once these are lost they're gone forever.
I am happy with the weight and the fact they are non-glare. It gets a little tricky loading in the paper when you have several to do - static doesn’t make things easy but all in all I’m happy with the product.
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.