First-Class Mail Shape-Based Template

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When shipping using Stamps.com, be assured of the correct postal rate by making sure you’re sending your mail as the correct type. Use our First-Class Mail Shape-Based Template and never have a flat rejected for having letter postage again! Color-coded design makes identifying mail classes simple Thickness slot for determining if a piece is a letter, flat or package Also determines if package requires non-machineable surcharge rate Guide can also be used as a ruler - accurate to 1/8" To be used for USPS First Class Mail rate determinations only Show more