Sinkbox
A sinkbox is a specialized hunting blind used by waterfowl hunters. It consists of a weighted, partially submerged enclosure large enough to hold one or more hunters and suspended from a floating platform. It is placed into calm water so that the hunter may wait with the waterline at approximately shoulder height.
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Sinkboxes were typically used by market (rather than sport) hunters for duck or other waterfowl in both the United States and Canada.