Abstract: A system includes a controller for monitoring a fill level of a container. The controller is configured to receive first vibrational response data relating to a vibrational response of the container in a first state, receive second vibrational response data relating to a vibrational response of the container in a second state, and use the first vibrational response data and the second vibrational response data to identify a change in fill level of the container between the first state and the second state.

Abstract: In some forms of the invention, an absorbent article (e.g., training pants) includes an impermeable cover, an absorbent body and a temperature change member disposed with the absorbent body. The absorbent article further includes a liquid retarding member that is disposed with the temperature change member to temporarily maintain liquid in the temperature change member. The liquid retarding member is formed of a liquid dispersible material such that the liquid retarding member eventually dissolves in the liquid and flows into the absorbent body. In other forms, the absorbent article includes a liquid retarding member that is adjacent to a temperature change member which is formed of a matrix of fibers. The liquid retarding member has a hydrohead that is less than about 0.13 pounds per inch squared such that the liquid retarding member temporarily maintains at least some of the liquid in proximity to the temperature change member.