These sheet protectors are as good as the heavy duty ones but keep in mind that any heavy duty activity could ruin them slightly. While this has not happened to my sheets I just want everyone to be aware. I use them for protecting printouts that I use for presentations as well as for photo protectors.
I use protector sheets all the time - reason I don't want to run out!! They are excellent for keeping needlework patterns and downloads contained so I can store in a binder.