must-have

noun
UK /ˈmʌst.hæv/
US /ˈmʌst.hæv/

A must-have is something you really need or want a lot.

A warm coat is a must-have for winter.


OTHER MEANINGS

2. Something that is very popular and everyone wants it.

This toy is the must-have of the season.

3. Something you cannot live without.

Water is a must-have for life.

4. A thing that is required for a certain activity.

A helmet is a must-have for bike riding.