Flats (USPS)
The United States Postal Service uses the words "flats" and "nonletters" interchangeably to refer to large envelopes, newsletters, and magazines.
Size restrictions
To fit the definition a flat must:
- Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long (the side parallel to the address as read) OR ¼ inch thick.
- Be no more than 12 inches high x 15 inches long x ¾ inch thick.
- Weigh no more than 13 ounces.
Furthermore, the item must be somewhat bendable: see the USPS Domestic Mail Manual for exact details. This general rule does not apply to: Automation rate flats and Standard Mail Enhanced Carrier Route flats.
Postage
The maximum size for a flat provides enough room to enclose much material. An issue, however, is that the higher the weight the higher the postage, especially for First-Class Mail.
External links and references
gollark: I warn you: any aeons I breed will be messy.
gollark: *has three aeons, no pinks*
gollark: https://dragcave.net/lineage/[CODE]/iamacheater
gollark: So either they're just ignoring that, they actually don't, or they think that longer lineages are more valuable, or that magmas are rarer.
gollark: They probably also understand that their egg is not CB.
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