I use page protectors to safely store children's artwork in binders. They are excellent for storing recipes and craft projects- just pop out of a binder and use without worry that contents under plastic will get ruined. Medium weight is a versatile choice because they take up less room than heavy duty but are still sturdy for handling and reuse.
I use these sheet protectors on info that I print off the computer and want the material to hold up to the constant referrence to the pages and these sheet protectors work well for what I need them to do.