Go to (whisper) wilkinson's the cheeeeep supermarket where the poor people go and buy a roll of their open weave rubber matting roll about 1.99 for three meters, cut a chunk off and put that between the tank bag and the tank. problem solved!
synthetic chamee leather from halfords slightly damp grips real good and can be used to remove dead insects from visor in the wilds, this also works great with throw overs