Ziploc is an American brand of reusable, re-sealable sliding channel storage bags and containers originally developed and test marketed by Dow Chemical Company in 1968 and now produced by S. C. Johnson & Son.

In 1951, a company called Flexigrip was formed by Romanian Steve Ausnet who purchased rights and set of patents from Dane Borge Madsen who originally developed the plastic zipper.

Ausnet then licensed rights from a Japanese company, Seisan Nippon Sha) who had incorporated plastic minigrip type zippers into bags.

In 1964 Minigrip (Flexigrip) negotiated exclusive manufacturing and selling rights with Dow Chemical Company for the grocery trade (supermarkets) in the United States.

In 1986, Signode and Dow formed a company, namely Zippak, to develop zipper bags for food products.

[2] In 1997, Dow Chemical sold the rights of DowBrands, which included Ziploc, to S. C. Johnson & Son for between $1.3 and $1.7 billion.

[2] The Ziploc Evolve sandwich bag was so successful that it was deemed the "Best in Show" at the 2010 Best New Product Awards in Canada.

[5] Ziploc faces strong competition from such competitors as Glad, Hefty, and many privately owned, generic, store brand plastic bags and containers.

As Jules Rose, chairman of Sloan's Supermarkets Inc. in New York City, states: "This is a highly competitive market with a lot of players and unusually strong private label sales."

In 1992, Ziploc was faced with sudden competition from the booming sales of arch-rival First Brands Corporation's Glad-Lock bag.