Looking for non-window Security Envelopes? Choose from our wide selection of security-tinted envelopes, which help protect mail containing sensitive information. Ideal for mailing checks, invoices and a variety of other important business communication. Your recipients will appreciate security envelopes protecting their private information. Shop for Security Envelopes.
Need an envelope that fits most business checks? Choose from our selection of Check envelopes and find a product perfect for your mailing needs. Shop for regular and window envelopes for checks, in many sizes, with or without an inside security tint. Available in many popular sizes including #6 3/4, #7 3/4, #8 5/8, #9, and #10 envelopes. Shop for Check Envelopes.