The bags and other containers that hold a traveller's belongings.
"After waiting at the carousel, she finally located her heavy luggage among the pile of suitcases."
In plain English: Luggage is any bags, suitcases, or boxes you pack to carry your belongings when traveling.
"We had to leave our heavy luggage behind at the train station because there was no space in the car."
Usage: Luggage refers to all of your travel items collectively, such as suitcases or backpacks, rather than any single bag. Use the plural form luggage even when referring to multiple pieces, since it is an uncountable noun in standard English.
In the 1590s, "luggage" was formed by adding "-age" to the verb "lug," meaning literally that which is dragged around. The word entered English with this original sense of heavy items being hauled along.