Abstract: A container system allows a user to register a bulk product unit at a predetermined elevation by engaging a stop disposed at a deepest point of an engagement slot. The engagement slot is disposed in a wall of a container containing a chamber having an inlet for receiving a product vessel. The neck of the product unit may be lowered into the slot, thereby moving the product vessel through the inlet of the chamber, and positioning the dispensing valve outside of the container. The first embodiment further comprises a retrofit system for adapting an existing product cooler to contain a saddle to support the neck of a bulk product unit. In a second embodiment, the container system is designed to receive and dispense gravity fed flexible packages, such as bulk wine. In a third embodiment, the container system comprises a product unit that is refillable, sealable, and separable for cleansing.