I use these by the 1000's every family group sheet photo and document are stored in page protectors most of them purchased from staples and in the large quanity packages.
Why store lots of bulky magazines when I can remove the quilt patterns I want to use and place one in each sheet protector? Easy retrieval and proctection.
I use the sheet protectors for my recipe pages so when I am cooking the recipe can be easily cleaned. Also great for my "genealogy" book that I put together so I can protect my pages for years to come.