I recently bought a backpack - after realising that my Tom Bihn messenger bag, much as I love it, was knackering my back.
After looking at all the lovely and cool and trendy bags I ended up with
https://www.thenorthface.co.uk/shop/en-gb/tnf-gb/vault-backpack-chj0
(& paid a lot less than that for it on Amazon)
I can carry film making kit (Drone, several cameras and couple of go pros), laptop, iPad, hard disks, midi controllers etc (& shove a clean shirt in)
it’s not cool. it’s not fancy but it has turned out to be a good backpack 