We carried a SPOT tracker, 2 iPhones, an iPod, a marine radio, and a camera. We kept these charged with a Suntactics solar charger.
Many paddlers do not carry a VHF Marine Radio. We carried a Standard Horizon HX300, a model we chose simply because it was rechargeable via USB. We used the radio to communicate with the lockmasters, and it was worth it for that purpose alone. Also, we listened to channel 13, used by tow pilots to communicate with each other. After listening to channel 13 for a few weeks, and after learning from a retired barge deckhand that it is appropriate for recreational boats to speak on channel 13, we did speak with tow pilots on a few occasions. Finally, the VHF radio is by far the most effective way to request assistance if you have a life-threatening emergency in the water.
Our entire load, skin out, including canoe, paddles, electronics, camping gear, all clothing, repair kit, PDF’s, dry bags and so forth weighed 116 pounds. Food and water added to that. A lot more weight than lightweight backpacking, but not heavy compared to what we understand other people travel with.