A breast pump system is provided with a suction tubing and a milk tubing, wherein the suction tubing and milk tubing each have first and second ends, and comprise a unitary tube structure. The system includes a first connector that has a first portion for coupling to a breast pump and the suction tubing, and a second portion for coupling to a milk bottle and the milk tubing. The system also includes a second connector that has a first portion coupled to a suction port of a breast shield and the suction tubing, and a second portion coupled to a breast milk collecting port and the milk tubing. A breast shield system with a flexible diaphragm and a cover is provided that may be coupled to the breast pump system. A dual suction path filter cartridge is also provided.