Custom Tyvek Envelopes Large Tyvek envelopes are the most durable type of envelopes made. These 10 x 13 envelopes are used by businesses who ship documents that need to survive a harsh transportation methods. These 10 x 13 business envelopes are custom printed with your business name and address, and have an open end dimension of 10 x 13 inches and an imprint area of 8.5 x 11.5 inches. Large 10 x 13 Tyvek envelopes are printed on standard Tyvek material with large first class mail printed in the center of the envelope and all around in green triangles.
