YOU SAID:

I can't pack my trophy in my luggage because it doesn't fit in it.

INTO JAPANESE

トロフィーが収まらないため、荷物に入れることができません。

BACK INTO ENGLISH

I can't put it in my luggage because the trophy doesn't fit.

INTO JAPANESE

トロフィーが合わないので荷物に入れられません。

BACK INTO ENGLISH

I can't put it in my luggage because the trophy doesn't fit.