three - dimensional , sports - related cover assemblies for propane tanks are provided in order to permit sport - or team - related decoration of the tanks . the cover assemblies may be separable from the tanks or may be integrated and unitized with the tanks . the assemblies have contoured or concavo - convex outer surfaces , which are configured to give the three - dimensional likeness or appearance of a sports - related item , such as athletic head gear , footwear , balls , or other equipment .