Use this First Class envelope for any purpose. The larger size provides more room to mail larger tax returns or thicker documents. This envelope is constructed of 14# tyvek paper stock with a peel and close flap which opens on the short side. The tyvek material provides tear and water resistant protection to your confidential mailings.
Specifications:Size: 10" x 13"Weight: 14#Material: TyvekFlap Opening: ShortSeal: Peel & Close