I used the Wolfman large dry duffle for an around the country 35 day trip last summer. The bag was "bullet proof". With the roll top you can roll it smaller or large if the need arises. The straps it came with will hook to your rack for your GIVI trunk bag. The bag is absolutely waterproof...
The challenge getting into the battery access on the Gen III-brought a smile to my face! The first time it was frustrating--I really did not know what to do next-and I was afraid of breaking something. I discovered the plastic is much more flexible than I at first thought. I put it back...
