Luggage Deposit Facilityat Suzhou Railway Station

Dear sir/mdam,
I read from the above that there is a Luggage Deposit Facility at Railway Station. May I ask how much is the estimate cost to deposit a piece of luggage? We will be coming to Suzhou from Shanghai by rail. We would like to drop our luggage at the Railway Station, so that we can make a day trip to Tongli before we return to continue our journey to Hangzhou.
Thank you.