must-have
nounUK /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.