When we phoned jet2 to ask they told us that a long as it fits their cabin bag measurements then it was ok but there would be no exceptions if oversized.
We flew with TUI last year and took the butterfly with no issues, was so handy to have straight off the plane x
We stored our bugaboo overhead tying with emirates
Sounds good, think I'll get it then with the travel bag x
No but hoping to in may so keen to hear responses