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Greeting Cards Packaging: Cello Bags, Envelopes and Postage

Greeting cards packaging has two layers: a clear cello (OPP) bag that keeps the card and its envelope clean, and a stiff outer such as a board back envelope or a 20mm large letter box that stops the card bending in the post. Our smallest OPP bag is 6.5 x 9 inches (165 x 230mm), which suits A5 and 5 x 7 inch cards and is roomy on A6 cards. Wholesale bundles go in a larger OPP bag, then a large letter box or a cardboard box with kraft paper.