fit in
am going on holiday and some items do not fit in the suitcase.
In my bag there are things that do not fit in.

Is this the correct verb here?

Thsnks

Question

fit in
am going on holiday and some items do not fit in the suitcase.
In my bag there are  things that do not fit in.

Is this the correct verb here?

Thsnks

Answer

In your second statement you use 2 "in"s.  You could just say, "Some things don't fit in my bag."  Or "I can't get everything in my bag."

Answer

You will  also hear  "fit into" in the first sentence.