columbian co856 10x13-inch tyvek first class mail white envelopes 50 count
designed for ultimate protection . protect what s inside . superior moisture burst and tear resistant protection . features convenient and secure self-sealing grip-seal closure . simply peel off release strip and press down for a quick secure seal . first class border ensures priority attention . lightweight white tyvek material . sized 10 x 13 . quantity 50 envelopes .