20″ x 24″ + 4″ Bottom Gusset Poly Mailers – Heavy-Duty E-Commerce Shipping Bags
Expandable gusseted poly mailers engineered for bulky e-commerce shipments requiring extra capacity and puncture resistance.
These 20″ x 24″ gusseted poly mailers feature a 4″ bottom gusset that expands to accommodate bulky items like folded apparel, multiple products, or irregularly shaped packages. The 2.5 mil co-extruded film construction delivers superior puncture resistance and tear strength compared to standard poly mailers, protecting shipments during rough handling in sorting facilities and delivery trucks. The water-resistant design shields contents from rain, snow, and moisture during transit.
The white exterior surface provides a clean, professional appearance for branded shipping while offering excellent opacity to conceal package contents. The reflective silver interior lining adds an extra layer of moisture protection and reinforces the bag structure. The self-sealing adhesive closure creates a tamper-evident seal that shows if the package has been opened, providing security for high-value shipments.
Manufactured from co-extruded polyethylene film, these mailers combine multiple resin layers for enhanced strength and durability. The gusseted construction allows the bag to expand without splitting or tearing when filled with bulky items, eliminating the need to oversize standard flat mailers. This design reduces dimensional weight shipping costs while providing reliable product protection.
Key Benefits:
- 4″ bottom gusset expands for bulky items without bag splitting
- 2.5 mil co-extruded film provides puncture resistance and tear strength
- Water-resistant design protects against rain and moisture
- White exterior with silver interior for opacity and professional appearance
- Self-sealing adhesive closure creates tamper-evident seal
- 200-bag case quantity reduces restock frequency for high-volume shippers
- Reduces dimensional weight shipping costs vs. oversized flat mailers
Specifications: 20″ x 24″ + 4″BG | 2.5 mil thickness | Co-extruded polyethylene | White exterior / Silver interior | Self-seal adhesive closure | 200 bags per box
Common Applications: E-commerce apparel shipping (jackets, sweaters, hoodies), multiple-item orders requiring extra space, bulky product fulfillment, retail merchandise shipping, soft goods distribution, warehouse pack stations, 3PL fulfillment operations, subscription box packaging.
What is a bottom gusset on poly mailers?
A bottom gusset is an expandable fold along the bottom edge that allows the bag to open wider and accommodate thicker items. The 4″ gusset on these mailers provides extra capacity for bulky products without requiring a larger flat mailer, reducing shipping costs while maintaining protection.
What mil thickness is best for e-commerce shipping?
2.5 mil poly mailers provide heavy-duty protection suitable for most apparel and soft goods. Lighter 2 mil bags work for t-shirts and lightweight items, while 3.5 mil bags are ideal for shoes, heavy clothing, or items with sharp edges that require maximum puncture resistance.
Are gusseted poly mailers water-resistant?
Yes, co-extruded poly mailers are water-resistant and protect contents from rain, snow, and moisture during shipping. The sealed seams and self-seal closure prevent water infiltration under normal delivery conditions, though they are not designed for complete water immersion.