Helpful Tips Luggage/baggage vs. suitcase/bag A common mistake among non-English speakers is the difference between luggage and bag. The word bag is countable, which means we can say many bags or 3 bags whereas luggage is uncountable and it can mean either one bag or many. If you want to make the word luggage plural, you would add the phrase ‘pieces of…’ in front of it. How many pieces of luggage do you want to check in today sir? 2 pieces. Okay, that’s fine.