I was going to for the arm through the visor elbow in the helmet way, but I thought maybe someone had a better idea?
I got a top box for the GS but planning on going out and meeting some friends on the GSXR and will need to take a spare lid, and was wondering which was the best way to carry the lid.
If your head is a lot smaller than your mate’s head then you could wear two helmets . . . means you get double the protection, less wind noise and nothing to carry
Alternatively, post the helmet to where you plan being, then post it back after it’s been used.
I don’t know what you’ve got as bungeeing points, but going from the pillion footpeg up, through the visor of the helmet and out the bottom towards something under the other side of the pillion seat should work, do both such that they crossover in the helmet and you’d likely find it’s fairly secure, assuming the bungees are tight enough.
It is of the bowling ball carrying type, so the handles are not quite big enough or separated enough to be used as a rucksack.
I am also concerned of the dangers of carrying a very tough, quite large round object on my back. A heavy fall could do quite severe damage. It wouldn’t fit in any of the rucksacks I have either, despite my fears I did check.
Just remembered though that I do have a gym type of sports bag, which has a shoulder sling that I could use, where the bag will rest on the back seat while slung around my shoulder.
That should push the bag off of my back in any accident situation.