shìyījiān zài nǎlǐ?
Where is the fitting room?
不要袋子。
No package needed
不要 (bú yào) means "don't want," and 袋子 (dàizi) means "bag." So it's literally "don't want bag."
我不要袋子。
wǒ bù yào dàizi
I don't want a bag. — More personal because it includes the pronoun "I".
不需要袋子。
bù xūyào dàizi
No bag needed. — Synonymous, slightly more formal with 需要 (need).
您需要袋子吗?
nín xūyào dàizi ma?
Do you need a bag?
不要袋子。
bú yào dàizi
No bag needed.
Appropriate
Avoid when
You can say "不要袋子" (bú yào dàizi). It literally means "don't want bag" and is used to refuse a bag in a shop.
It is pronounced "bú yào dàizi". Note that 不 (bù) changes to bú before a fourth tone like 要 (yào).
Use it when a cashier offers you a bag or starts to bag your purchase and you don't need one. It's neutral and polite in any shop.
Tomyo
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