Whirl Pak 7oz / 207ml Sterile Bag, Clear, pk 500Whirl-Pak Sampling Bag - Polythene bag with tab and wire frame at top that allows the bag to be opened wide and sample to be added easily. - - - Nasco's patented sterile Whirl-Pak Sampling Bags for sampling in the food, dairy, water, sewage, medical, veterinary, environmental, soil, and industrial laboratories. - - - Their sterility, strength and ease of storage has helped to replace more bulky and costly sterile plastic containers in sterile sampling. - - - The bags are resealed by pulling the tabs and whirling around the wire. - - - Suitable for solids, semi-solids and liquids.- - - 500 bags per box - - - Size: 9.5 x 18 cm,,,,,,,,,,,,,,,,,,