3M Post-It Super Sticky Removable Label Pad - 2 7/8 in x 2 7/8 in - 25 Sheets - Pack of 3 Pads

I purchased these at a local office supply store right after they came out to use in my classroom. They work pretty well considering they are a sticky piece of paper. The only surface that they have had trouble sticking to so far are flexible plastic file folders, and only the corners have turned up so far. Overall, these are a good product for helping with organization, and I would recommend these to anyone.