Blue Summit Supplies #9 Invoice Envelopes, Windowless, Self Seal, 500/Pack

#9 Windowless Security Envelopes Create Completely Secure Mail We understand how difficult it can be to find security or privacy envelopes that completely secure and hide your envelope contents throughout the mailing process. Our envelope design protects your mail contents throughout transit all the way to its destination. Windowless design is the safest type of envelope, with no chance of confidential information showing through windows. Easily print, write, or add labels to address the envelope. Quick and easy to use our self sealing design, featuring a strong adhesive that completely secures your contents to prevent them from falling out and being lost or shown to others. Dark black security tint lining is completely opaque and blocks others from seeing your documents Thick and durable 24 lb white paper stock that completely protects your contents during transit, with no need to worry about it tearing during transit Save time sending your mail by printing directly onto the front