Security Envelopes | Business Envelopes with Inside Tint

Shop for Security Envelopes and get FREE shipping. Choose from many popular envelope sizes - #6 3/4, #8 5/8, #9, #10 - with inside security tint lining. Available with or without a window, Security envelopes are perfect for mailing checks or other documents with sensitive information. The inside tint makes it difficult to read information inside the envelope.

Security Envelope Size Guide

#6 3/4 (3 5/8 x 6 1/2) - Fits a personal check, plus a small insert - up to 3 1/2 x 6 1/4.
#8 5/8 (3 5/8 x 8 5/8) - Ideal for many printed commercial and business checks.
#9 (3 7/8 x 8 7/8) - Return envelope. Fits comfortably inside a standard #10 envelope.
#10 (4 1/8 x 9 1/2) - Standard business envelope. Fits an 8 1/2 x 11 piece of paper folded in thirds.

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