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