Standard 60lb Uncoated Envelopes for affordable Envelope printing. For businesses who would prefer convenience, opt for Self-Adhesive Envelopes which allow for quick sealing. Finally, businesses that mail out sensitive information, such as invoices and contracts, should print Security Envelopes. Our Security Envelopes feature a tint inside that ensures documents stay confidential. Most importantly, custom printed Envelopes with a company logo prompts brand recognition and reinforces professionalism.