Miscellaneous
Gadgets: My bike has a dynamo hub that puts out up to 6V. In order to capture the energy and power my other electronics (bike lights, ipad, cell phone, headphones) I rigged up a 20,000maH external battery to a port off the dynamo. It isn't enough to keep me powered up for extensive electronic use but it helps power me through basic needs since I will often go days without access to a power outlet.
First Aid Kit: I have crazy allergies so I have an epi-pen with me, prophylactic doxy in case of a tick encounter, neosporin, bandaids, ace bandage, gauze, net bandage, acetaminophen, bug spray and face masks.
Tools: Mini tire pump, spare inner tube, tire patch, Allen wrenches, spare screws, zip ties, tire levers and tiny scissors.