The Conestoga wagon is a specific design of heavy covered wagon that was used extensively during the late eighteenth century, and the nineteenth century, in the eastern United States and Canada. It was large enough to transport loads up to 6 tons (5.4 metric tons), and was drawn by horses, mules, or oxen. It was designed to help keep its contents from moving about when in motion and to aid it in crossing rivers and streams, though it sometimes leaked unless caulked.