Every backpack I've ever bought I was able to easily find all the relevant specifications I needed in order to choose a quality a pack. If you're looking at a pack which doesn't provide such specifications then that's an immediate giveaway that it's a low quality pack. It's not difficult, the average person really just does not care to do research. They instead just choose the cheapest one with the advertising that hooked them the best. But the information is there if you want it.