I used to use the Logitech K480 for this, which is a non-folding Bluetooth keyboard with integrated phone stand. Though it was as bulky as carrying a small tabl

I used to use the Logitech K480 for this, which is a non-folding Bluetooth keyboard with integrated phone stand. Though it was as bulky as carrying a small tablet or laptop would've been, it was still convenient - at the time my only laptop was a 17" tank.