Flat Tyvek First Class Envelopes - End Opening - Plain 9 in. x 12 in. 100 Ct.

First Class Envelopes - 9 x 12.  Flat Tyvek Envelopes are made from a 14 lb. olefin, resulting in strength ten times that of a standard paper envelope.  These end opening plain Flat Tyvek Envelopes feature self-sealing closure.  Quantity 100.