For me, it depends on what kind of trips you're taking. I have 2 Travelpro duffles. One for 2-4 day trips and the other of 5-7 day trips (business casual dress). Both small enough to qualify for carry-on. If I have to play dress-up on a 3+ day trip, I take a roll-aboard and ship it under. I rarely take more than 1 of the above mentioned bags, plus a briefcase. If I'm traveling more than a week, I send out the laundery.