May be a little late for Dancanovas, but I have this tank bag...

http://www.enduristan.com/en/product...-tankbags.html

Has survived everything that I could throw at it! Very tough, clever expansion system that hasn't failed me yet, removable map pocket and a handy little waterproof document pouch velcro'e to the inside of the lid...

Would highly recommend... Have a good look in the shop, I managed to find one in the clearance section for about half price... Very fast shipping too, considering it came from Germany I believe...

I also got the Enduristan Tornado 2 XL roll bag... amazing water resistance - bone dry inside after falling out of a canoe!!