Peak-season shipping costs begin rising before the holiday rush reaches its busiest weeks. Here are the 2026 USPS, UPS and FedEx seasonal charges online sellers should build into their Q4 pricing and fulfillment plans.
USPS made several important package-shipping changes on July 12, 2026, including a lower dimensional-weight divisor, new dimension-rounding rules, revised Ground Advantage commercial pricing, expanded cubic eligibility, and new hazmat fees.
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