I'm looking at two backpacks made by the same manufacturer that are essentially the same (size and shape are slightly different but not enough to make the decision easy). The main difference is that one is made of 500D nylon while the other is 1000D nylon. They are both pretty close price-wise as well (the 1000D less than $20 cheaper).
What are the pros and cons of the different materials?
I know the 500D will be lighter, but will it resist abrasions as well as the 1000D? And what about water resistance?
Thanks in advance for your opinions and experience.