The present disclosure relates to a storage bag for expressed mother's milk, particularly one which can receive the milk directly from a pump. The hanging milk storage bag includes semi-circular perforations or other lines of weakness for creating an aperture to receive the breast milk pump. The hanging milk storage bag further includes upper linear perforations or other lines of weakness for creating an opening at the top of the hanging milk storage bag for pouring the contents into a subsequent receptacle. The hanging milk storage bag further includes a leak-resistant zipper for forming a storage volume.