The Whirl-Pak® Stand-Up bag gives you the freedom to perform important laboratory functions with both hands, because it will stand up completely by itself. No rack or other holder is needed to keep the bag upright. When the sample is placed inside, the special gusseted bottom flattens out, allowing the bag to stand up on its own. It works just like a beaker or bottle, however, it costs less, is sterilized, wonąt break, and uses only a fraction of storage space as the other containers. Stand-Up Bags make it very easy to add material to the bag or remove samples for testing or analysis. The flat bottom ensures stability and the wire tabs hold the top open for easy access. Bags are equipped with a convenient write-on strip for easy sample identification. With write-on patch.