YOU SAID:
Don’t forget to bring his clothes in his backpack.
INTO JAPANESE
彼の服をリュックサックに入れることを忘れないでください。
BACK INTO ENGLISH
Do not forget to put his clothes in the backpack.
INTO JAPANESE
彼の服をバックパックに入れることを忘れないでください。
BACK INTO ENGLISH
Do not forget to put his clothes in the backpack.
That didn't even make that much sense in English.