You know you need to bring a universal power adapter to Europe. Right?
So, you add one to your list and throw it in your carry on. Right?
Great. That will let you plug in exactly one of your devices. How many devices do you need to plug in? Probably more than one. Right?
Phone…tablet…another phone…camera battery…you get the idea.
Instead of one power adapter, pack a wall plug which offers two to four USB ports. You can then charge your devices when you need to without waiting for one to finish before charging the next one.