Patent ID: 7380679

Claim:
A container comprising: a bottom; four side walls rising from the bottom, the four side walls including: a first side wall having at least one projection; a second side wall opposed to the first side wall and having at least one indentation which corresponds in shape, size and location to the at least one projection of the first side wall; a third side wall which extends from the first side wall to the second side wall, the third side wall having at least one projection; a fourth side wall opposed to the third side wall and which extends from the first side wall to the second side wall, and which has at least one indentation which corresponds in shape, size and location to the at least one projection of the third side wall, and a cap attached to the four side walls, the cap having four side walls which fit over the side walls of the container, an opening in one of the side walls of the cap which corresponds in shape, size and location with a projection in a side wall of the container, and a cover attached to the cap, and wherein the projection of the first side wall is in the form of an annular projection, and the indentation in the second side wall is in the form of an annular indentation.