I travel with a helmet

I am almost packed. There are still a few things that need to be packed - or not packed. Depending on how much space I have. For example my helmet.
Last year I flew to Scotland together with my bike and had my helmet attached to my carry-on. A little boy saw this and tugged his Daddy's coat sleeve: "Daddy, why does she have a helmet?".
And I said: "Ah yes, it's these cheap airlines. You never know what's going to happen. And they make you pay extra for everything - now you even have to bring your own life jacket!".
And the little boy said: "Daddy, did we bring our life jackets?!"