Traditional-style, economical envelopes for your everyday mailing needs. The #10 Regular is the ideal envelope for quality, affordability, and versatility. This is the perfect envelope for any use. From home use to business use, this envelope will deliver all of your needs. The multifunctional envelope is ideal for checks, mailing letters, invoices, bank statements, and much more. This envelope can also be inserted by machine. So if its the workhorse of the envelopes that you're looking for, you've found it here!