What is a polybag, and why it matters for direct mail. The Polybag versus the Constructed Poly Envelope: We’re all familiar with the many types and sizes of polybags, thanks in part to eCommerce. Polybags, also known as polyethylene bags, provide an economical shipping choice that protects against dirt, moisture, and tampering. Poly bags are used to ship, protect, hold, and store just about everything from candy and food .
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