Stack-On .004 cu. ft. Steel Portable Security Case - Realtree Xtra. Feel confident that your valuables are safe and secure when you are on the go or away from home with Stack-On's Portable Cases. Designed to secure a wallet, credit cards, cell phone or other valuables while you are on the go. This slim steel case slips into a briefcase, under a car seat or in your luggage for added security when you are traveling. Includes 1,500 lbs. test steel cable which keeps the case secure, locking the case keeps the cable in place, meets TSA airline guidelines, case is secured with a key coded lock (includes 2 keys), foam interior protects the contents during transit.