These envelopes are made of pliable yet damage resistant plastic and make it easy for you to carry all your needs without bulk! Each one has a rectangular certified hook and loop closure the ensure tight closing and easy opening. Use them to sort and protect your documents against bending and tearing while the three hole punch gives you the convenient option of placing into your favorite binder. Stay organized by color categorizing your papers with this multi-color set! Details: Assorted colors 9.75" x 11.5" overall size Sides expand up to 1" Fits standard sized sheets of paper 18 envelopes Hook and loop closure with 3 hole punch Plastic