I bought these to put my handmade cookbook pages in. They may be a medium weight but they hold up very well and keep the spills and stuff off the pages.
They’re a heavier weight than what I needed but Staples doesn’t seem to carry light weight sheet protectors anymore. Maybe because those would sometimes tear? These don’t. They’re a little tight going over standard 3-ring binder rings which is kind of weird but they fit and they do what they’re supposed to. I also fit a lot more than 1 sheet in each sleeve with no problem.