Simply peel off the release strip and press Office Depot self-sealing envelopes are made from white wove paper for durability. Office Depot Clean Seal envelopes form a secure seal quickly, with no moisture required. Office Depot Brand Clean Seal catalog envelopes feature an open-end design. Allows you to fill envelopes quickly and easily. Office Depot white catalog envelopes in 10" x 13" size are a great choice for mailing all of your documents and papers.