Initially purchased them for travel. But have found them equally useful in organization of important documents and work handouts. Recently discovered that they can be easily punched with a Tul punch. Now I am using them as plastic folders for loose letter paper in my letter size disc Tul notebooks. When the project folders are punched, letter size paper is a little tight but it works for what I need it to do. The folders are clear and durable. For travel I have color coded specific use folders with different color cardstock (inside: front and back page) for quick identification, plus adding a little extra protection to the documents inside. Very impressed with the quality of the product, haven't found anything in a store that matches this product for quality, price and versatility.