Translation:This baggage is light.
According to Jisho "suitcase" translates to スーツケース or 旅行鞄/りょこうかばん (ryokoukaban). A suitcase can be luggage, but not all luggage is suitcases.
My answer: These luggage are light. "Correct" answer: This luggage is light. Am I missing something?
luggage is a collective noun, thus is uncountable and has only a singular form. its determiner and the following verb must agree with it accordingly.
What's the difference between luggage and baggage?? I don't get why luggage is wrong?
This baggage? Baggage is an uncountable noun and cannot go with this or these
"This" can work with uncountable things. "this water", "this sand". These would not work though.
Would sound poetic though...
"Where did the old pirate ship sink, Grandpa?"
"Well, my boy... it sank in these waters."
I suppose that adding an 's' to the end of such objects turns them into nouns or something like that. Or the 's' makes it plural and counted so that you can use 'these' with it?...
... I give up. I know not how to English.