First Class, Open Side, Expansion, Tyvek Envelopes, 18 lb. Heavy Duty
Virtually indestructible! WATERPROOF, and LIGHTWEIGHT. White Flap-Stik Seal.
Open-Side, Expansion, First Class, 18 lb., White.
Made of 18 lb stock making these Tyvek envelopes even stronger than the usual 14 lb ones.
This Tyvek envelope may not be imprinted.