The KATA bags look very much like a camera bag... not really useful if your aim is getting a camera bag which does not look like a camera bag, i.e. Crumpler...
If I am not wrong, CRUMPLER bags are made from DuPont Codura Plus... its very durable and hardy... CODURA is used in making bags/pouches for the US military...
I agree with the observation that your gear in a Crumpler bag can potentially get wet during a downpour as the closing of the flap is not as "weatherproof" as that of a Lowepro...
true.. but ppl like us who are interested in photography can easily spot a crumpler camera bag right? hee..