Loving these rubber bands from the Museum of Useful Things!

Up top, Diamond Corner Bands ($6/box of 10): One continuous reusable rubber band with no seam, place around the corners of your folders to keep files in order.

Next, 4-Way Rubber Bands ($6/bag of 10): These bands stretch four ways to hold objects of any shape like books, catalogs, or even round film reel cans. They can also be used as an alternative to ribbon for gift wrapping.