A system for reconstituting and sterilizing a concentrate includes a mixing container, a filtration device, and a product bag. The a mixing container has an inlet port and outlet port in fluid communication with a mixing chamber disposed between the inlet port and the outlet port. The mixing chamber is adapted to contain a product concentrate. The filtration device has an inlet and an outlet, the inlet of the filtration device coupled to the outlet port of the mixing container. The filtration device includes a filter membrane with a nominal pore size in a range of approximately 0.1 μm to approximately 0.5 μm. The product bag has an inlet port coupled to the outlet of the filtration device, and has a bladder defining an empty sterile chamber for receiving sterilized and reconstituted product resulting from mixing a diluent with a product concentrate in the mixing chamber to obtain a mixture then introduced through the filtration device to obtain the reconstituted and sterilized product.