Quality Park R4650 Tyvek Expansion Envelope 12 x 16 White 100/Carton

12 x 16 Tyvek Expansion Envelope

Quality Park R4650 envelopes are designed for offices and shippers that need to mail bulky documents or samples without using boxes. Each carton contains 100 white mailers made from DuPont Tyvek for tear and puncture resistance. The open-side format and Flap-Stik peel-and-seal closure speed up packing workflows. They suit any business sending flat but thick items regularly.

Build and daily handling

Tyvek material resists rips, tears and punctures while remaining water-resistant and moisture-resistant in transit. The expansion gusset allows the envelope to accommodate thicker stacks without splitting at the seams. Flap-Stik closure requires no tape or moistening — just peel the liner and press to seal. Lightweight construction keeps postage costs lower than equivalent cartons.

Two-inch expansion capacity

The 2-inch gusset depth is the single specification that determines whether your bulky contents will fit. Measure the thickest item you plan to ship; if it exceeds this expansion limit, a larger mailer or box is required. For items within the limit, the envelope replaces costly cartons while maintaining document security.