A flexible container for fluid administration is provided having a bodydefining a cavity, a base, and at least one portcomprising a flange in contact with a flange of a terminal port having apunctureable membrane layer. The body has a cross-sectionalconfiguration including a lower body section of a first dimension, a middlebody section of a second dimension, and an upper bodysection of a third dimension, wherein the second dimension is smaller than thefirst dimension and the third dimension. The flexiblecontainer may also include a base having a plurality of creases that arefoldable to form two folded ends each including an extensionhaving a base of a first dimension and a tip of a second dimension.
