Standard 10-foot storage containers are retrofitted shipping containers with one or two sets of doors on either end. Secure locking mechanisms or padlock lock systems are available on most units. Special requests such as interior shelving, weatherproofing, or refrigeration may be available at some locations. Exact storage container dimensions can vary from location to location. ISO standard heights are 8-foot 6-inch height storage containers or “high cube” storage units which are 9-foot 6-inches tall.