I love Case Logic products, I have several different items they make, and this one is very nice as well.I purchased this to protect my Samsung Series 7 Slate PC and it does a great job.  The material it is made from is soft and thick enough to protect the slate from inadvertent pokes and bumps.The one negative aspect (and maybe with use it will stretch a bit) is that the zippered opening is about 1/16th of an inch (or about 1.5mm) too small.  I have to be very careful not to accidentally hit the power button when putting it inside (certainly the slate will turn off in a few minutes, but it will be hotter than heck by the time it does) and it take a bit more force to coax the slate out when I want it.I do not believe it is water-proof, however, I have run from the car in the rain with it, and it did not soak through. I was in the rain for about 10 seconds and it was not a deluge, so I would not assume that your contents would survive unscathed from something more than a few splashes of water, but usually that is all should be allowed to hit anything holding electronics anyhow.If the opening stretches with time, I will update this review (and probably raise the stars), but for now it offers good protection for my slate PC. 

Question: How thick is the material of the bag?
Answer: The material it is made from is soft