Is "あれはだれのかばんですか" well written?

Question

Answer

Yes, there's no problem:)

Answer

Yes, you can say so.
あれはだれのかばんですか？（Who does this bag belong to? ）

あれは私たちのかばんです。（That's ours.）
あれは私のかばんです。(That's mine.)
あれはぼくたちのかばんです。
(ぼく　can be used for men. meaning the same with 私)
あれはぼくのかばんです。

Answer

Yes, the first one. Who does this bag belong to? Is it well?
Also Does it work with a group a people? I mean Does someone can reply saying "私たちのです"?

Answer

does this translate into:

who does this bag belong to?
whose bag is that?
does this bag belong to anyone?