Vacuum-gas plasma tissue culture-treatment provides consistent cell attachment, spreading, and growth. Convenient reseal tab on the bag. Innovative bag materials that will not scuff or scratch the flask's optical surface. Double-wall bags provide increased sterility assurance. Medical-style, peel-open bags guarantee that flask sterility is maintained. Recyclable bag material (Low Density Polyethylene). Knife not required for case opening. Phenolic caps contain non-toxic liners.