A block boot (1) having a rectangular ground plan, a bottom (5), and four side walls (2, 3). On the interior of the side walls (2, 3), ribs (10, 15) extending in parallel to the bottom are arranged. At least one of these ribs (10, 15) tapers from the respective side wall (2, 3) toward the interior of the block boot to a free end having a vertex line.
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