On Sun, 11 Dec 2016 06:02:16 -0800 (PST)
trader_4 wrote:
Actually, First Class is for up to 13 oz, not 1 lb.
Used to be 13, now it's under 1 lb.
Results
What is First-Class MailŪ?
First-Class MailŪ is the least expensive, most immediate option for mailing postcards, letters, and large envelopes 13 ounces or less. First-Class mail over 13 ounces is called Priority MailŪ. Prices are based on shape, weight,
7/16/2015
http://faq.usps.com/