Shop regular envelopes
This style, known as Regular envelopes simply means that it is a closed face envelope with no window. They are the most commonly used in business to send letters, invoices, checks, and other mailings. The #10 size envelope is the most widely used envelope of them all.
#10 Regular Envelopes
4-1/8 x 9-1/2
The most common business envelope, also known as a "commercial" envelope.