Enjoy the ease of working with your sample in a Whirl-Pak bag that stands upright by itself. A special gusset creates a flat bottom when the sample is placed in the bag, allowing the bag to stand completely on its own. May be used to hold liquids or solids. Available in 4 oz. and 18 oz. sizes. (120mL and 540 mL with a convenient write-on strip. Pack of 500 bags.