Joining Beijing city tour with nexus holidays on May 7 2014 for a day tour and I need an storage for

Yes, the luggage storage service is available at the T3. You can find the sites at the East and West of public space of Arrival Hall at 2nd foor of T3-C! Here is the charge rule:
For a baggage with length + width + height 200cm: 50 RMB/each baggage per day
Electronic password locker : Charge is based on locker’s size and service time.