Do-It-Yourself Projects In Norwich...

Scotchlite piping/chevrons is always a good idea - or that new stuff that is black in normal light but high viz in headlights.

Plenty of different pockets & compartments, hangers for bag-mounted leds etc..

Don't actually like the idea of loads of different pockets and compartments on the inside of the bag, perhaps have a pocket on the outside of the bag for all your organised stuff.

Keep the main compartment nice and empty, how annoying is it when you try to fill a bag but you can't because there's a divider in the way.