Question

. The airline allows only two pieces of luggage. You _____ (had better not/ better not/had

not better) pack too much or you will have to take some of it out at the airport.​

Answer 1

better not

Step-by-step explanation:

had better not and had not better are grammartically wrong

Answer 2

better not

Step-by-step explanation:

talking about the future so it's warning you not to do somehting