The #9 envelope is probably the most widely used envelopes for both business and personal letters. These envelopes, often referred to as "return envelopes", are commonly used as business reply envelopes as they can easily be inserted into #10 office envelopes. This #9 white wove envelope is ideal for everyday usage and used to send letters, invoices, receipts, and a few sheets of documents. This envelope is made from 24 lbs white stock paper. These #9 office envelopes are perfectly compatible with inkjet and laser printers. The envelopes have a familiar V-shaped flap and a blank windowless design. When ordering, customers can choose to get their company logo and business information pre-printed on these envelopes.