A lightweight, portable folding seat or stool designed for use while camping or in military field camps.
From camp plus stool. The campstool became standardized military equipment in the 18th century, designed to be light and portable for field officers and soldiers.
The campstool is actually a fascinating engineering challenge—it needed to be light enough to carry on a march but sturdy enough for an officer to sit on repeatedly, so 18th-century military design solved portability problems 200 years before modern camping gear existed.
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