By.CAuSE OF conflicting reports in the literature cor~cernmg~ the effects of plaStic containers on/red blood cells (1-7), r has been and still is some hesitatio~ in substituting plastic for glass containers for blood storage. As evidence of tl~ uncertainty, there is the known fact that many! of the blodd banks ,are still using both types of container indiscriminately., xni order to throw ligh[ upon the problem, our present investigation was ~'~tertaken with the practical objective of finding out which is less deti'imental to/red! blood coils. Howev.er, it must be