USPS First Class Mail
This rate only shows when the weight is 13oz or under.
USPS Retail Ground
This rate only shows when the shipping distance within the US is far. So if you are using an address that is in the same or neighboring state as your ship from postal code, it will not show. We don't recommend ever using this carrier rate as your only rate. Instead pair it with, or use USPS Priority Mail instead.
USPS First-Class Package International
This rate only shows when the weight is under 4lbs. Use this rate only in addition to USPS Priority Mail International.