Sending not urgent parcels to Europe (Jakarta)

Hello everyone, I wonder if anybody can give a good recommendation for a rather cheap way to send a few parcels (3 or 4 ala up to 10 KG - maybe be up- or downsized in weight or amount to the best combination of weight and cost) for storage in Europe. I am not planning to use dhl, fedex or the alikes as they provide speedy transportation for hight transportation costs, which is not needed. Same probably applies to a private carrier company. Any suggestions?
Tx, dirk