How much cash can a traveller bring to Hong Kong?

NO, you can bring any amount of cash into Hong Kong. You even do not need to declare to the customs. Hong Kong does not control the in or out flow of cash. Hong Kong enjoys a free trade and currency control. But HK cares about money laundry.Big amount of cash input to bank would be reported to the government.

Hong Kong takes import control on dutiable items e.g. liquor, tobacco, alcohol and fuel.

2006-11-15 12:39:11 補充：
幸運虎先生，我不介意你評價，但敬請客觀和公正。發問者問帶現金入香港的問題，我回答香港的法律。別人無講是什麼地出境，也完全無提及中國，如果這樣回答，你也可以講俄羅絲或什麼國家的出口限制。而且發問者是在法律版問的，不是什麼旅行版問，人地純是問法律。