noun
1
BAD : There was no room in the car for all our luggages.
GOOD : There was no room in the car for all our luggage.
BAD : He had brought a heavy luggage with him.
GOOD : He had brought some heavy luggage with him.
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Luggage is an uncountable noun: 'Do you have any more luggage?'
2
BAD : I spent the morning packing my luggage.
GOOD : I spent the morning packing (my bags/suitcases).
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pack or pack a bag/suitcase (NOT pack ... luggage ): 'I haven't finished packing yet.' 'That's not the way to pack a suitcase!'