1, to be all-rounder, to do data-reconciliation, to manage people-porters, warehouse keepers, tally clerks, drivers, and to deal with all kinds of people;

2, can operate computer systems, and now most warehouses use management systems, WMS or ERP；;

3. Control inventory losses,

4. Improve efficiency, such as space utilization and loading efficiency;

Usually the disadvantages are rising costs, safety and hygiene, three defenses and other issues.