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If you usually travel alone, you may not want more than two or three pieces of luggage. After all, why buy more than you can carry? A 3-piece luggage set -- typically a larger suitcase, a smaller suitcase and a carry-on -- is often enough for business travel and short vacations.
One exception is when you are traveling with someone else, such as a spouse or child, and can share (and carry!) a 6-piece luggage set between you. Of course, if you're able to attract an entourage to carry your bags, the sky is the limit!