Just as a reference, 420d nylon is what the Valoroso line uses as a lining on the inside of the bag.

That said, the stuff is rugged enough to be used on the outside. And what Andiamo uses as a lining is not a ballistic weave. What A. Saks uses looks different, so it is probably a different weave and the 420d is just a weight indicator. I wouldn't be worried about the durability or hardiness of the A. Saks line especially if you don't check the bag. Of course, it won't be as rugged as BR, Tumi or Andiamo but you have to look at the weight and the price, too. It weighs a third and costs a fifth of their products.

Till