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When only one thing is meant we say a clap of thunder and a flash or bolt of lightning.
We can say a loaf of bread and loaves of bread: I bought a loaf (two, three, etc.,loaves] of bread.
Baggage, another word for luggage, can't be used in the plural either: The baggage is ready for the train.
Furniture is a singular noun and always takes a singular verb and pronoun. A piece of furniture means one thing only.