Jeeeeze some people really pack on with the accessories!
I make my load as light as possible...i have been riding for a while and i figure the most important thing i have used as been a 5mm allen key. I take an allen key 'multi' tool (it has all the different allen keys in that fold out).
No way do i bring scissors never needed them never will....used to bring duck tape but it was a waste of space (never thought about wrapping it around the seat post though!). I bring a pump that fits in vertically in my hydration pack.
I bring:
1. Spare Tube
2. Pump
3. Patch Repair Kit
4. Tyre levers
5. Allen key
I bring my phone and some food, lots of water and THATS IT!