Question: what is the difference between first class and presort?
Answer: First-class mail is used for postcards, letters, large envelopes, and small packages. First-class mail must weigh 13 ounces or less. ... USPS first-class delivery is given priority over standard mail, and local mail will typically be delivered in 2-3 days. Nationally, first-class mail should be delivered in about 4 days.