http://www.luggagelocker.com/
I found this company from another post looking for a tank / cowl bag that will not scratch the paint of my RC. Les has been very helpful on the phone and email. I emailed him last night to see if he's ever made a product to carry a helmet. Turns out the bag I have on order will do the job!
This is what he wrote (also see the image he sent). GREAT STUFF!
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Nick,
The bag you ordered
WILL hold a full faced helmet and the seat. I've attached a pic I just shot for you of the bag on my RC51 fitment jig I keep in my workroom. This is one of the old bags I keep there, but I put a helmet in it and shot the pic for you. The bag has plenty of room to hold a helmet...so...your wishes are already taken care of!!!!!!!!!!!!!!!!!!!!!!
Let me know if this answered it.
Thanks again. Call me
anytime.
Les 888.414.2903