Blue Summit Supplies #9 Invoice Envelopes, Windowless, Self Seal, 500/Pack BSS-92588-020 while others will hide parts

while others will hide parts of the addresses

it was designed with the classroom in mind

Our mild adhesive will stick on your walls for weeks

Quickly and easily send hundreds of business invoices or statements with our #10 envelope design and our easy to use Flip and Seal Flap

Blue Summit Supplies #9 Invoice Envelopes, Windowless, Self Seal, 500/Pack BSS-92588-020 while others will hide parts#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