must-have; indispensable item; necessities
Refers to an item that is essential or highly recommended to have, often in a specific context such as travel, work, or daily life.
I made a list of must-haves for the trip.
This dictionary is an indispensable item for Japanese learners.
Compound of 必 (certainly, must) + 携 (carry) + 品 (item). The exact historical derivation is uncertain, but the word is a straightforward Sino-Japanese coinage.