I have 2 two bags, one is a suitcase and the other is a backpack.
The reason why I bought my suitcase is that it’s light and durable. The Surface is made of plastic, that so it is comfortable to carry and that is durable, not to break broken easily. and never tored.

And I bought the backpack is that I bought to carry books and devices like a laptop and iphone pro.
This is made of plastic fabric so it's also durable and lightweight. I think efficiency is the best. I'm all for efficiency so I'd prefer to buy plastic not expensive leather one.