Do you have a light weight paddle? Wood burning stoves are ideal for canoe camping. There are featherlight options. Check them out in "Reader Reviews". For choices of Dry Sacks, Carol Crooker reviews several models in "SpotLites". Look for a large lightweight tarp. Even if you do not sleep under a tarp, they are great to set up either for shade or to cook and stand under at your campsite in the rain. It can also be used to cover your gear in your boat. One advantage to packing gear into garbage bags is that they will float if you tie them closed. Then again, maybe you are not planning on flipping over. Granite Gear has waterproof bags, portage bags, and other canoe accessories.
Another article with ideas for keeping gear dry with reviews of bags: