Amazon.com : Self-Adhesive Button Fastener, String-tie Button, Eyelet Button, String Fastener for Envelopes (100pcs) – Add Function & Ease to The Envelopes : Office Products
1968 - Envelope with zip fastener: The inventor of this envelope with zip fastener of paper is Alfons Miller of Augsburg/Germany. If people want to open this kind of envelope they don't
Brass fastener - Wikipedia
Office Depot Brand Round Head Fasteners 1 Brass Pack Of 100 - Office Depot