In Taiwan, you need to pay two dollars to buy a bag when you go shopping in a supermarket. It is suggested that everyone takes his own bag with himself in order to reduce garbage and pollution.

Both of it are right to respond , or you can respond "好"

Q：需要袋子嗎? / 要帶子嗎? A：要，謝謝(這樣回答就好了) 如果不要，要說「不用，謝謝」或是「不需要，謝謝」，在這不可以說「不要」，感覺有點高傲。