CellStor Freezing Bag Sets can be stored in liquid nitrogen, vapour phase of the liquid nitrogen and at -80 C or at low temperature. CellStor freezing bag sets is used to freeze and preserve cells (hematopoetic, mesenchymal, embryonic, induced pluripotent), tissues (cord, adipose, placental, overian, testicular), skin, bones, organs, semen, embryos, oocytes, vaccines, proteins, blood derivatives (packed red blood cells, plasma, platelets, platelet lysates, albumins, cryoprecipitate) and other biological specimens. CellStor freezing bags are made up of special grade Ethylene-vinyl acetate (EVA), also known as polyolefin.