Please can someone suggest me something with plenty of pockets. Maybe a couple of side pockets for his (750ml) type drinks bottle. Other pockets for keys/wallet etc etc. It'll mainly hang off the back of the electrical wheelchair and it doesn't have to be bulky. Just needs to have enough capacity.
I'd say lots of pockets so he can ID where stuff is stored and direct his personal assistants appropriately. YKK zippers is a must, as is quality stitching and longevity.

Thoughts?