A few other items can be very helpful, I keep most of this in a 20L dry bag.
First Aid kit
Rescue throw bag with floating rope
Rescue Stirrup
Paddle float
Beach Towel
3 or 4 bottles of water
All good things to have but in reality many of us don't have a kayak that can haul all of that along with gear/tackle. I always have a bottle of water, a spare shirt, couple of granola bars (I change them out every month or so), pair of wire cutters, spare flashlight (mine is a headlight), about 50' of paracord and a first aid kit. If you're in a paddle only kayak a spare paddle is a good idea.
Of course these are "required" items but should be on most kayaks.