I too have tried and tried to find a good tankbag. I tried the magnetic bag from a previous bike, and well that just doesn't stick real well. The other problem with the tank bags is scratching. I have been working with this guy for a Triumph application. I sent him the specs for the 02 Daytona, and I am waiting on the product. Check out
http://www.rocketlocker.com/tanklocker.html
I have met this guy at a couple of times at races and shows, and I think he is on to something. Hope this helps,
E