Kala UB-C étui pour ukulélé concert
It quite neatly accommodates a 3-octave USB mini-keyboard (Korg MicroKey2 37), and the wide section for the ukelele body is big enough to fit a full-size 1st-gen iPad in a cover, underneath the keyboard. There's also just enough room at the side for a little 2 x 6W bluetooth stereo speaker bar (but make sure to get one of the smaller ones, like the Tribit Xsound Go, or the ZoeeTree S3, I would say). And finally there's a handy, if slim, pocket at the front for cables, adaptors and other bits-&-pieces.
The bag is lightweight but padded, with an extra buffer-pad at the bottom - to protect your iPad, obviously. ; )
It seems well put together, and has a padded carry-handle as well as back straps.
All round the UB-C is satisfyingly ideal for the purpose, and a great buy if you want to play music with your iPad on the go.