Explanation

Anas ibn Mālik (may Allah be pleased with him), the servant of the Prophet (may Allah's peace and blessings be upon him), mentioned that whenever the Prophet (may Allah's peace and blessings be upon him) would enter the bathroom, Anas, along with another servant, would bring a small waterskin which he used to purify himself with water. They also used to bring something to conceal him from the sight of people, which was a short stick with an iron tip to be fixed in the ground and a garment or the like would be hung over it so as to hide him from the sight of passers by, and also to be used as a Sutrah in case he wanted to pray (i.e. to place it before him so that no one would pass right in front of him while praying).