A container made of cardboard for storing cereal.

A metaphorical term for something that is empty or without substance.

खाली या निरर्थक चीज़

English Usage: His promises turned out to be just a cereal box, empty inside.

Hindi Usage: उसकी वादे सिर्फ एक अनाज का डिब्बा निकले, अंदर से खाली।