It very much depends on the sort of travel that you're going to be doing. If you're going somewhere where you will have to carry your luggage around a great deal then, yes, a backpack is ideal. However, backpacks are not good for two things: keeping your clothes flat and neatly pressed and they're not good for ease of access.
If you are travelling somewhere a bit rough and tumble but won't have to carry your kit much then I suggest a duffel bag - there are some great ones on the market that are water resistant, strong and going up to around 100 litres in size. If, of course, you're gong somewhere where your personal presentation is important then you can't beat the good old-fashioned suitcase for looking after your clothes.