On a recent trip to France I was able to get a full set of cocert pies and a 3/4 set of B uilleann pipes in the one case. They shared the same set of bellows but each had their own pipebag.
This case was a little too big for the over head luggage container onboard Flybe, but it was allowed on board Easyjet.
If you are taking pipes by easyjet, it is worth drawing attention to the easyjet musical instrument policy on their website, the staff probably won’t know about it. I was refused taking the pipes on at Paris until I told them about their policy.