bag是不是可數名詞

Put the bottle in a plastic bag in case of spillage.

把瓶子裝在塑料袋裏，以免灑得到處都是。

How should I know where you've left your bag?

我怎麼知道你把包丟在哪兒了？

Take this bag, and leave everything else to me.

把這個包拿走，其他所有東西都給我留下。

Could you watch my bags for me while I buy a paper?

我去買份報紙，你能替我照看一下我的包嗎？