Wearable breast pumps are provided which utilize compression to enhance milk expression. The breast milk expression systems herein can allow breastfeeding users to obtain milk discreetly and comfortably in the presence of others. These systems compress the breast at one or more locations, such as at a base of a breast and/or along inferior and lateral sides of a breast, to stimulate milk expression. Various components and methods for expressing milk can facilitate milk output. For example, vacuum can be used in conjunction with compression. For another example, one or more temperature sensitive components can be utilized to improve milk secretion. In some embodiments, milk can be collected in a sterile custom storage container located around or beneath the breasts to facilitate wearability. After expression is complete, a quick-release valve can be used to detach the storage container from the pump and can prevent leaks.
