"Is there a bag?"

Translation: 鞄はありますか？

[PhngPhie]

I also wonder why it's written in katakana here

[Fleyon]

I believe katakana can be used to emphasise a word in written phrases, much like we would use italics. I don't know if this is the reason here, though.

[Anne-Cercueil]

It can also be seen with が instead of は

[ddoepsh]

Is it different from 鞄(かばん)?

[JeffreyHua18]

No

[DayHop1]

im no expert, but doesnt this work with or without the は?

[emmessjee]

Yes.

[Tony_Kaku]

So they skipped the は on the other question (にもつおもくないですか) but mark it wrong without it here?

[Chariael]

Should be が, right?

[Corgincognito]

I've read that in questions は is preferred, but both should be fine anyway.

[DreamiLand]

So は and が are interchangeables because it is uncertain whether it's there?

[WeraWolf1]

Not really. は emphasizes what comes after the particle, while が emphasizes what the particle follows. For example: 鞄(かばん)はあります literally means "as for bags, (they) exist", while 鞄があります means "bags exist".

(Note: please don't translate japanese sentences literally during the exercises, I only did so for illustration purposes.)