These 10 x 13 x 1 1/2 inch white Tyvek® envelopes are built from 18 lb spunbonded olefin, a material that outperforms paper in puncture resistance, tear strength, and moisture tolerance. The 1 1/2" expansion gusset accommodates bulky flat contents — multi-page documents, catalogs, booklets, and soft goods — that would stress a standard flat mailer.

The peel-and-press self-seal strip requires no moisture activation and produces a tamper-evident closure. The consistent white exterior accepts labels, direct printing, and barcodes cleanly, supporting standard warehouse labeling workflows. These envelopes perform reliably through humidity exposure and rough handling during transit.

Sold in cases of 100. Common applications include e-commerce fulfillment, B2B document distribution, retail replenishment shipments, and manufacturing parts distribution. Ships via parcel carrier.