A container assembly including a body portion with a front wall, a rear wall, and lateral side walls connecting the front wall and the rear wall. The body portion may be divided by a horizontal partition into an upper waste portion above the partition and a lower weight sensor portion below the partition, wherein the weight sensor portion includes a weight sensor. A container assembly may include an opening disposed on the rear wall of the body portion and a bag dispenser positioned near the opening and disposed on an interior surface of the rear wall, wherein the opening provides access from the bag dispenser to an interior space of the body portion.