You're talking about the black plastic box that the ER-4P and its accessories come in, right? If so:
Weight (with everything inside including ER-4P): 9.2 ounces
Weight (box and foam insert alone): 6.5 ounces
Dimensions: 6 1/2" long X 5 3/8" wide X 1 15/16" high
Hope this helps you out.