How carriers calculate dimensional weight, the current UPS and USPS divisors and rounding rules, worked box examples, and practical ways to cut DIM charges.
Seven 3PLs for small online stores compared on order minimums, warehouse count, platform integrations and how pricing works, from each provider’s own pages.
The landed cost formula, line by line: product cost, freight, insurance, duties, customs fees and inbound handling, with a worked per-unit import example.