Very strong, sturdy material. This is not the first time I have bought these luggage, they last forever! the reason last one I had to throw away because my cat pee on it, seriously I was bummed out because I had used it to travel and was not even gentle with it and took all the abuse, still look brand new except my cat for whatever reason decided to spray on it. I bought the black and the red. I am now careful with it to put it in a safe place. I can tell you with certainty these luggage last a lifetime they do not make stuff like this anymore, so very happy with the purchase, I am even contemplating buying a few more and give them as gifts, what a great idea! who does not need luggage? I think is a perfect gift, hey and if they don't like it is more for me ;-)