German "Pfand" on bottles in English?

I'm currently looking for a proper translation for the German word Pfand. Here in Germany we have 25 EUR cents on some plastic bottles (not all) like soft drinks or even caned drinks (not all cans).

When we bring that empty bottle/can back to the supermarket and put it there in a machine for one-way-bottles/cans, then we can that 25 EUR cents back for each bottle (that has a proper symbol on it's cover printed).

dict.cc gives me a lot words for this: pawn, collateral, mortgage, pledge, deposit, forfeit, earnest, security, gage. I can rule out 2,3 and 5, 6 sounds strange. Any ideas which might be the right one?