Flimsy has a clare hard to get paper into-not very strong - I am bringing them back. if you're doing a term paper or something you only need to use once. Otherwise if you're using them for my purpose-to hold sheet music I reference a lot - not a good pick.
The sheet protectors are good for the money but the problem is that they are difficult to open the first time. I needed rubber fingers to adhere to them to pull them apart. Once opened they were fine. (It wasn't just me; spouse had the same issue.)