I've seen a couple of posts stating that ThinkTank's are great and the best. I have to disagree. I have a backpack which is OK but lacking in features compared to e.g. a LowePro (but LowePro didn't have a similar size) and a "holster 50" which I use to carry my camera+bg+400mm f5.6. The holster comes with a rain cover. It is placed in a pocket inside the bag. Packed in the pocket the rain cover takes up so much space in the bag that I have to work hard to get the camera/lens in and out of the bag. But that's not the worst part. If I have my gear packed in the bag and the rain starts poring, I have to open the bag and take out the camera so I can get to the rain cover. So I will have to get my gear and the inside of the bag wet in order to protect it from the rain. That isn't greatness in my book ! IMHO LowePro bags are better designed.