A Worldwide Leader in Reclosable Polyethylene Packaging and Zipper Bags. A worldwide leader in reclosable packaging technology, Minigrip® has provided innovative packaging solutions since the 1950s. In fact, Minigrip introduced the first integral zipper in the Industrial Packaging Market in the US in 1959. And when we did, we marketed our new product with a red line on the lip of each bag. Since then, our trademarked Red Line has become synonymous with the highest quality zipper bag in the world