Poly Mailer Shipping Size Helper
Preset package size for DIM weight across carriers.
Formula
DIM = ceil((L×W×H) ÷ divisor). Billable = max(DIM, actual). Preset: 14×10×1 in.
Worked example
Preset poly-mailer at 2 lb — compare USPS (÷166) vs UPS/FedEx (÷139).