luggage

I took two luggages on holiday.
I took two pieces of luggage on holiday.
I took two suitcases on holiday.

My luggage were too heavy.
My luggage was too heavy.

Luggage is an uncountable noun. It has no plural form and takes a singular verb. To count individual items, say ‘two pieces of luggage’ or name the items: ‘two suitcases’.