A suitcase is one item — a rectangular case you pack clothes into. Luggage is the collective word for everything you travel with, whatever the shape. You can own three suitcases; you cannot own three luggages, because luggage is uncountable. "Baggage" means the same as luggage and is the commoner American term.
The core difference
- suitcase — a countable object: one suitcase, two suitcases
- luggage — an uncountable collective: my luggage, a piece of luggage
The grammar is the practical point. Luggage behaves like furniture or equipment: no plural, no a in front of it. To count it you need a unit — two pieces of luggage, three items of luggage.
Luggage and baggage
They mean the same thing. Luggage is the more usual British term and baggage the more usual American, though both appear on both sides — airports worldwide use baggage in signage, which is why baggage reclaim and baggage allowance are fixed regardless of region.
Baggage also has a figurative sense that luggage lacks: emotional baggage, the accumulated difficulties someone carries. You would never call that emotional luggage.
The words for the pieces
- suitcase — a hard or soft rectangular case, usually wheeled now
- holdall / duffel bag — soft, cylindrical, no rigid frame
- trunk — a large rigid chest, largely historical for travel
- carry-on / hand luggage — what goes in the cabin rather than the hold
- portmanteau — an old term for a case that opens into two equal parts, now better known for the word-blending sense it gave English
Frequently asked questions
Can you say "luggages"?
No. Luggage is uncountable, like furniture. Use "pieces of luggage" or "items of luggage" to count.
What is the difference between luggage and baggage?
Nothing in meaning. Luggage is more usual in British English, baggage in American, and airports use baggage in signage everywhere.
Is a suitcase luggage?
Yes — a suitcase is one piece of luggage. Luggage is the collective term for everything you travel with.