If you are traveling around and doing hostels, is turning up on the doorstep with a set of matching Samsonite suitcases really the image that you wish to project ?
Personally I always favor canvas kitbags, many moons ago when I was doing a bit of flitting back and forth to the carribean on business (yes, on business, it was hard work, really) I bought a large Head canvas "sports" bag and it served me well for many years until I bust the zip on it one day and even after that I continued to use it with the zip held together with safety pins.
It helps if you don't travel with breakables of course but a canvas kit-style bag cant get scuffed or battered about and is easy to sling over your shoulder and carry leaving you with two free arms for tickets, passport, beer and other important things.
It also sends my wife into fits of panic as she believes that all airport workers are just waiting to stuff huge amounts of drugs into baggage that can't be locked and even though I tell her that anyone is welcome to help themselves to my underpants, especially the ones that haven't been washed yet, she still insists on me tie-wrapping the zips before sending them down the luggage belt at the airport - which was a tad unfortunate once when customs called me back and asked me to open the bag and I couldn't because as I explained to them you aren't allowed to carry knives or scissors in airports and I always rely on the hotel at the other end having some, they had to go and find some scissors of their own
And the thing that made them call me back after the bag had been x-rayed ?
Just 20 foot of ropelight lying on top of my clothes, fortunately they didn't ask why I was taking it to Barbados as my reasons were a bit flimsy and consisted of "he made me do it"