Gas/Gaz cylinders.

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(23 July 2012, 13:08)Hrusai Wrote: you can exchange them for full ones!!! awesome may have to go to mole valley soon xD

Yup, have to exchange them. Once upon a time you could return the empty ones for a "refund" of the security deposit you paid to get the cannister. But because of the amount of thefts of the cannisters they put a stop to that

You can size up / down accordingly too, so if you have a 15kg and you want a 4 or 7kg one, then they should swap it for you. Plus if you're sizing down then they're quids in.