A device to store and transport materials and tools, for example, paint and painting implements, to and from a worksite while shielding the floor, floor covering, table, table covering, or other supporting surface from material splatter. The coating layer comprises at least one coating material, and is stably affixed to the substrate to form a stable, coated surface. Also, a chassis coupled to be opposite to the mold frame for closely fixing the backlight assembly and liquid crystal display panel to the mold frame is formed to be gradually thinner as further advancing from the first side of accepting to place the light source portion toward the second side opposing to the first side. The swing arm is actuated by actuation means such that the heel pad moves in an arc. In some embodiments, if the network device implements multiple consecutive back-off intervals, the network device can determine whether to vary the duration of a second back-off interval depending on whether a transmission by another network device is detected on the communication medium after a first back-off interval elapses.