Cotton Rag Winter Collection * Inside: Blank * A1 size (3 1/2" x 4 7/8") * Recycled Cerulean Paper Envelope * Printed on Tree-Free Cotton Rag Paper * Plastic Free Packaging Cotton rag paper is the perfect example of tree-free, upcycled and recycled paper. As a natural product, cotton is completely biodegradable. Cotton bits, usually the by-products of manufactured cotton cloth, are color sorted, chopped, and pulverized then mixed with water and laid out to dry. The process takes about three days.