Bitran® Multipurpose Bags (Saranex® Series) - Special barrier film protects against air and leaks. Easy to reenter and reseal (Com-Pac) Use these Bitran® specimen storage bags for collecting, transporting and storing tissue specimens. Bitran® bags' engineered simplicity allows your lab to process specimens more efficiently without sacrificing time or space. Bags are made of 3-mil-thick barrier film. Saranex® series bags are made from a special five-layer polyethylene and Saran® film, which provides odor control for long-term storage. Polyethylene series bags are odor penetrable and are for use in shorter term storage. 250 bags per package.