Personally feel that, in most cases are required to cloth, cold moisture, to a certain extent, to protect the bottom of the tent is not a small stone cut or can. However, if the sand in the camp, it is best not to use canvas drop cloth, if it is easy to rain areas, between the cloth and the bottom account will be serious water. The purpose is to lay the cloth: First, clean, and second, moisture, prevent cold, but also to prevent weeds puncture, bug.