|Height||6-1/8 inches||12 inches|
|Length||11-1/2 inches||15 inches|
|Thickness||1/4 inch||3/4 inch|
* Large envelopes exceed at least one of these dimensions.
For example, an envelope 10 inches long x 8 inches high x 1/4 inch thick is considered a large envelope because it exceeds the minimum height dimension.
Large envelopes that are rigid, nonrectangular, or not uniformly thick pay package prices.
For large envelopes, length is the longest dimension.
For larger items, see package prices.