Custom Polypropylene Mailers Custom printed poly mailers are specialized shipping envelopes made from polypropylene that can be customized with personalized designs, logos, or branding. They are commonly used by businesses for shipping products or promotional items to customers. The difference between polypropylene and polyethylene is rigidity. Polypropylene is more rigid and has a higher perceived added value. Both are often used for catalogs and booklets. Here are the steps .
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