Not only are these great for separating my files into individual bags, but I tried running water over them and they are water proof except for the top with the zipper. So, spilling water or coffee on them won't ruin the contents. They are a good size and it's easy to put a stack of paper into them, because they are slightly oversized and there is no struggle to try and get the papers into them. I am an office supple freak and love all things organizing so I love these. I am also going to use them to keep my first aid supplies dry when I go to Disney World soon. It will make it a lot easier for secruity to check my bags when they can see the contents. So many uses for them. I'm just getting started...