Gauge vs. Mil .006 6.0 mil. Super Duty .004 4.0 mil. Extra Heavy .003 3.0 mil. Heavy .002 2.0 mil. Standard .0015 1½ mil. Economy .00125 1¼ mil. Light .001 1.0 mil. Extra Light .00075 ¾ mil. Super Light This chart is to help you determine what poly bag will work for your application. Some companies sell the bags by the gauge, where as most of our bags are sold by the mil thickness. Below you will be able to cross reference your bag. As a reference point, a standard Ziploc sandwich bag is .0015 (1-1/2mil). Tip: Don't forget to check out our line of TUF-R bags as they can replace a 1-2 mil bags at a lower cost but with the same strength. Samples may be requested at any time by contacting us. Email us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or call toll free (888)743-0907.