How to say “The boxes were supposed to be stackable, but the lids cave in as soon as you put one on top of another.” in Japanese
In Japanese
この箱、重ねられるって書いてあったのに、一個上に載せただけでふたがへこむんだけど。
Kono hako, kasanerareru tte kaite atta no ni, ikko ue ni noseta dake de futa ga hekomu n da kedo.