Pick sizing, first. Suit duffels are a clever piece of origami: You put the suit in the bag, and then roll the bag in a tube, zipping in the sides to turn it into a duffel. However, that generally means you get a medium sized duffel bag, with a capacity of 45 liters or so, out of the deal. So, while you can definitely pack shoes, belt, some books, and a tablet, you may need to have a second piece of luggage to haul the rest. And don’t forget to ensure it is carry-on sized!