علم أصول الكلمات () English from the 14th century, from a Dutch kitte, a wooden vessel made of hooped staves. Related to Dutch kit "tankard". The further etymology is unknown. The transfer of meaning to the contents of a soldier's knapsack dates to the late 18th century, extended use of any collection of necessaries used for travelling dates to the first half of the 19th century. The further widening of the sense to a collection of parts sold for the buyer to assemble emerges in US English in the mid 20th century.