Best controller for playing on an airplane?

Hello all!

I have an 8 hour flight to Alaska coming up in a month. I downloaded Delta emulator on my iPad Mini 7 and was seeing what controller you all would recommend to use on the airplane with my iPad Mini? I have a case that gives me a kickstand so I plan on just placing it on the tray as I really don't wanna have to hold the iPad the whole flight. Looking at just grinding through some Pokemon Games or Playing like original Zelda and stuff like that.

Looking for a controller that will easily fit into a sling bag or something small I plan on bringing with me since i'll be checking in a bag. Any insight is so much appreciated.

Thank you,