13 x 16 x 4" Expansion Poly Mailers (Case of 100)

• Dimensions: 13" x 16" x 4" exterior
• Material: 2.5 Mil Polyethylene
• Quantity: 100 mailers per case
• Weight: Approximately 4.66 lbs per case
• Shipping: Parcel eligible

These 13 x 16 x 4 inch expansion poly mailers are built from 2.5 mil polyethylene with a gusseted bottom that expands up to 4 inches, giving the envelope enough depth to accommodate thicker or irregularly shaped items without straining the seal. The white exterior and silver interior lining deliver a clean, professional presentation while blocking moisture from reaching contents in transit.

These mailers are a practical choice for e-commerce fulfillment centers, subscription box operations, retail distribution, and direct-to-consumer apparel or soft goods shipping — anywhere orders vary in thickness and a standard flat mailer won't reliably close. Labels, ink, and postage stamps adhere directly to the outer surface without primers or additional treatment.

Construction includes high-strength seams rated to hold under overpacked conditions, puncture and tear resistant walls, and tamper-evident properties for added security. The self-seal closure incorporates a double-perforation tear strip so recipients can open cleanly without scissors. Each case contains 100 mailers and ships via parcel carrier.