Other common uncountable nouns include: accommodation, baggage, homework, knowledge, money, permission, research, traffic, travel. These nouns are not used with a/an or numbers and are not used in the plural.
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From Longman Dictionary of Contemporary EnglishRelated topics: Tourism 'hand ?luggage noun [uncountable] the small bags that you carry with you when you are travelling on a planeExamples from the Corpushand luggage• Meg succumbed to the biggest smile she had ever seen in her life and surrendered her case and hand ...
Suitcases are the same as luggage, but you cannot say two luggages as luggage is a mass noun. When you travel you have luggage, or two pieces of luggage. Mass nouns use measure words like pieces of to make plurals.