Whirl-Pak® Bags, Developed in 1959 and manufactured in the U.S.A. Whirl-Pak® Bags were the first sterilized laboratory sample collection bag on the market. Whirl-Pak® Bags feature patented Puncture-Proof Tabs that eliminate sharp points which could puncture the bags, scratch a person’s hands, or tear gloves. Whirl-Pak® Bags are sterilized after manufacturing using ethylene oxide gas at an independent ISO-certified facility. Whirl-Pak® Bags are made from co-extrusion low-density and linear low-density, virgin polyethylene which creates the exceptionally clear film and superior strength associated with the brand.Whirl-Pak® Bags have a leak-proof closure created by whirling or folding the tabs over three times, thus, eliminating the need for a separate lid.Whirl-Pak® Bags reduce storage, labor, and shipping costs by 90%.