Reference
USPS Cubic pricing explained
When cubic tiers beat weight-based rates for small, dense packages.
Tiers
Cubic tiers are based on volume up to 0.5 cu ft; proper packaging may unlock lower tiers.
When cubic tiers beat weight-based rates for small, dense packages.
Cubic tiers are based on volume up to 0.5 cu ft; proper packaging may unlock lower tiers.