USPS Priority Mail is slower and more expensive. The time frame for delivery of one to three days includes Saturdays and Sundays, but it cannot be guaranteed. USPS First class has a time frame for delivery in one to two days on weekdays only, not weekends or holidays.
USPS Priority mail is the default shipping option when you shop online at etsy, amazon, abe books, global airmail etc. In general its where they charge the most money! It goes without saying that some products are meant for other types of shipping such as rush shipments or international – so be sure to use them instead- but also comparing your purchase options with these two can save you substantial amounts!
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