Clinical cellular therapy applications often times require a cell expansion or maturation step before use. Traditionally, cell expansion or cell culture is performed in “open” systems including multiwell culture dishes or tissue culture flasks. These “open” steps present risks and are not ideal for larger-scale manufacturing. The new EXP-Pak™ cell expansion container is a closed-system, gas permeable bag intended for expansion and culture of nonadherent cells. EXP-Pak™ bags are made from a unique polyolefin film that permits…