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Collection: 18x18" Poly Mailers Largest Size for USPS Cubic Softpack Tier 5

Our 18x18" flat poly mailers are perfect for USPS Cubic Shipping. Ship anything that will fit, under 20 pounds, for a low flat cost by zone.
2 products
  • 18x18" Green Cactus Designer Poly Mailers Shipping Envelopes Premium Printed Bags
    Regular price
    $19.99
    Sale price
    $3.99
  • 18x18" Blue Whales Designer Poly Mailers Shipping Envelopes Premium Printed Bags
    Regular price
    $19.99
    Sale price
    $3.99
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