A method for manufacturing a flexural plate wave sensor includes the steps of depositing an etch-stop layer over a substrate, depositing a membrane layer over the etch stop layer, depositing a piezoelectric layer over the membrane layer, forming a first transducer on the piezoelectric layer and forming a second transducer on the piezoelectric layer, spaced from the first transducer. The door includes a trigger for opening the door, and the handle and body are angled for ease in collecting and dumping debris. The rollers are arranged with the axes and shafts thereof arranged at an angle relative to the transport direction or the perpendicular thereof, such as to exert a tensile force on the circuit boards in the transverse direction thereof and thus stiffening the same. In a second embodiment, the nonwoven substrate of the present invention is comprised of a non-ionic binder and used along with a separate commercially available disinfecting or sanitizing solution. In one aspect of this embodiment, the container body includes a corner structure that can facilitate folding.