Maybe these? https://www.amazon.co.uk/AKG-Cancelling-Headphones-Wireless-Bluetooth/dp/B0721KKLB4/ref=asc_df_B0721KKLB4/
Not sure I'd trust on-ears but they do fold up well. Whathifi seems to like them. https://www.whathifi.com/akg/n60nc-wireless/review
Those AKG are absolute shite. Look nice and fold well but the sound quality is awful. Not sure what whathifi were smoking that day.
@Bainbridge started
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Maybe these?
https://www.amazon.co.uk/AKG-Cancelling-Headphones-Wireless-Bluetooth/dp/B0721KKLB4/ref=asc_df_B0721KKLB4/
Not sure I'd trust on-ears but they do fold up well.
Whathifi seems to like them.
https://www.whathifi.com/akg/n60nc-wireless/review