Shipping Rules

Shipping rules can affect how you prepare, measure, and compare packages before sending them. This category provides practical guidance on package dimensions, weight considerations, and the way size requirements may differ by mail class or carrier. Learn how to measure a box accurately, review USPS package size limits, and understand UPS maximum package dimensions and weight rules. The goal is to make shipping information easier to follow so you can identify relevant requirements before choosing packaging or arranging delivery. Use these resources as a starting point for planning, and confirm the latest details with the applicable carrier or service before shipping. Whether you are checking a box’s length, width, and height or comparing limits across shipping options, these guides help organize the key measurements and rules that commonly influence package preparation.