A storage locker is a secure, enclosed compartment used to store personal or business items for short or long periods. You’ll find them in places like gyms, schools, offices, and self-storage facilities, typically made from steel or heavy-duty plastic with a lockable door or digital access. Sizes range from small day-use lockers for bags and valuables to large units that can hold furniture and inventory. They’re rented or assigned to keep belongings safe, organized, and out of the way when space is limited.