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The article about 2007 Taipei Cycle show say's:

..."The Taiwanese manufacturer Hydraknight is already since 1995 on market and has a wide selection of drinking systems. The PET bottles with well working bite valve and a valve-clutch system ,which allows refill a bladder without open the backpack ,shows their experience. Easy refill is possible then ,does not matter if with a conventional bottle or even simply on a faucet .A hand pump with water filter is also in their program."....