Week long luggage storage at Shanghai Pudong Airport.

Nihaw, my family and I will shortly travel from France, via Pudong airport, to Osaka in Japan for a week's holiday. On our way back to France we will be stopping in the city for three day to attend a wedding.
We don't want to bring our suitcase with all our wedding clothes with us to Japan, as we are going hiking there and will use rucksacks. Us there a way to leave a suitcase in PVG on our way passing through.
We are arriving in Pudong with China Eastern Airlines (Terminal 1) and should have a five hour transit before departing from Terminal 2 with Spring Airline to Osaka.
We will arrive back in Pudong a week later from Osaka with Spring Airlines (T2)

Thanks in advance for your help,
Robin