Letter Perfect: Envelope Security Patterns ✉️

"The real collection of patterns is the physical collection. Envelopes are individually sleeved and kept safe in 3-ring Binders. This web page, the digital images of the patterns, are put in place so other people can enjoy these wonderful patterns."

cardioid has posted abstractcollage.com's amazing collection of over 500 security envelope patterns — designs printed on the inside of envelopes to obscure the contents of snail mail.

https://www.metafilter.com/198155/Snail-Mail-Security

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