Small musette/sacoche for iPad as a flight bag

Hi all, long term lurker first time poster. I am looking for a sacoche style bag (not a structured slings) which i can chuck an iPad with a keyboard (11inch) maybe a book, notebook, pens, powerbank and ideally some over ear headphones in so when i sit at my seat on my flight I have easy access to it all. Then I could chuck back in another bag whilst moving around so some protection of the iPad would be nice.Something expandable might also be nice, but really the smaller the better tbh so that it's practical.

I have seen the following but no idea if any of this will fit

- matador freerain sling

- klattermusen accessory bags

- CODE OF BELL ANNEX LINER II (this fits the bill but is a bit expensive and maybe a bit too tactical looking / to bulky)

- north face base camp shoulder bag

TIA

James