Made specially, this bag may be used in two different ways. Where CO2 incubators are not available in the system, the smeared Petri dish is placed in the bag (holds 100mmx15mm plate) with a CO2 pill and then incubated. The CO2 remains in the bag sufficiently long to provide the maximum growth of the organisms if present. Where CO2 incubators are available, Gono bags are ideal for the collector to use to transport smeared plates to the laboratory.

Resins used in the extrusion of film for Whirl-Pak® Bags are FDA approved. Bags are manufactured in accordance with the requirements for manufacturers of single service containers for milk and milk products. Capacity is measured in fluid ounces when bag is closed and tab folded over three times. Volume and dimensions are approximate; bags should not be used at temperatures above 180°F (82°C).