Columbian CO802 10x13-Inch Tyvek White Envelopes, 100 Count Envelope designed for ultimate protection. Protect what's inside. Superior moisture, burst and tear resistant protection. Convenient and secure self-sealing Grip-Seal closure. Simply peel off release strip and press down for a quick, secure seal. Lightweight white Tyvek material. Open end closure. 10" x 13" 100 envelopes