Looks like the British are getting a head start when it comes to battling the moutains of plastic bottle lurking in landfills everywhere.

The Tap Up collapsible and reusable drinking bottle eliminates our need for bulky water bottles by fitting neatly into a Oyster card wallet (a form of electronic ticketing used on public transport services within the Greater London area).

Fill it up, drink it down and then tuck it neatly back into its sleeve. Repeat as necessary.