My enquiry on how to bring back a top of the range helmet (>£500) from Germany has resulted in the following response. I love the way the don't even offer a reason as to why.
Looks like I will have to buy locally as there is no way I will leave a lid in cargo, packed or not.
Thank you very much for contacting us and for your interest in our company.
We have looked at your issue and we regret to inform you that motorcycle helmets are not allowed on board of our aircrafts.
If the helmet is well and safely packed, it is possible to transport it as Low Fee Charge luggage. Our personnel will be glad to help you.
Of course we are happy to assist you personally with your booking with Eurowings and settle all questions arising from this booking.