Zipper storage bag

Material thickness (gauge) varies; smaller bags are typically 40 to 45 μm.

[citation needed] In the same year, Minigrip licensed them as pencil bags.

The zipper storage bag's most recognized function was not realized until 1957, when a fifth-grader named Robert Lejeune demonstrated that the bag could also be used safely as a food storage device.

[6] Eleven years later, in 1968, Dow Chemical Company began marketing them under the name Ziploc.

Widetrack ribs were added in 1982, clicking zippers in 1993 and color in 1997.