It works for us to hold a propane canister for our outdoor shower while also allowing us to rest a towel on top.  It is narrow enough that it isn't enormous but leaves enough room for the coiling of the water hose to connect to the hot water system.  The lid doesn't close perfectly, but that's ok because there is a place to line it up in order to lock it, which we will never do, but we can use that connection with a little waterproof tie that holds it in place.  We chose this for the propane storage because we couldn't find a propane tank storage box that would plastic or any other material that could be outside in the elements all the time.