Thank you people, I can make it better!

It helps to have the "back story" of a word. If you type in "luggage etymology" you will get the following explanation from the first result: luggage (n.) 1590s, from lug (v.) "to drag" + -age; so, literally "what has to be lugged about" (or, in Johnson's definition, "any thing of more weight than value"). In 20c., the usual British word for "baggage belonging to passengers." Baggage, luggage, they both refer to the mountain of stuff we carry on a trip. It's like the "mobile" estate (home, assets, everything) of a person. My estate is the sum total of everything I own, therefore its impossible to have more than one. I can have "Sets" or "peices" of luggage, but no luggages. It's the way they said it in the 1500s, so we cant really ask them!! LOL!!!!! I also like Dave's answer.

Yes, it will take time to learn this...but everyday, use them and learn! I will usually ask the student if they can count: Example: Can you count one air, two airs, three airs? No! This does not always work...as Gregory says, you must use these and become familiar with them. Have a great English learning journey! :)

David's right. Luggage (or baggage) is an uncountable noun, meaning that, in the US at least, it never takes a plural form in the standard grammar. Unfortunately, there's not really a good way to know if a noun is countable or uncountable. You can look up lists online of some general rules, but there are many exceptions and it's just something you'll have to learn as you go along. Greg