Due to some time restraints I camped just south of Matheson Island both on the way to and from the island. Unfortunately I didn't have time to spend an overnight on the bloodvein, which had alot of beautiful spots to camp. I'll definitely want to revisit this area when I can put a few days together and have my launching wheel/cart system set up.
Good call on the barrel. Bears are the primary reason why these barrels are popular storage containers for food, dishes, utensils and cooking gear, particularly amongst canoeists in Canada. While the barrel won't be able to stand up to a bear trying to tear it open, it is waterproof and hence contains the scent of food quite well. That in combination with the harness that goes with it, makes it easy to suspend the barrel high up in a tree, out of a bears' reach. Here is a link to these barrels & harnesses;
Canoeists also like the fact that these barrels have alot of floatation (assuming reasonable loads are put in it), therefore they don't have to strap it into the canoe. This is important because if the canoe gets swamped in some rapids, there isn't a bunch of gear strapped to the canoe to prevent emtying the water and righting it. The barrel will float harmlessly downstream where it can be recovered later.
Fortunately, swamping a SIB in the rapids is much less of an issue. I had this happen going back downstream, where I hesitated with the throttle and stuffed the bow into a 4 foot tall haystack at the bottom of one particularly interesting set of rapids and stuck the boat against a rock. At that point I lifted the motor, dropped the elephant trunks, then pushed the boat free of the rock with a push pole and back into the flow. I then dropped the motor, started it and power drained the water through the 3" diameter scuppers. The remaining bit of water below the scuppers was drained with a manual blige pump. I always, always, wear merino wool socks, underwear and and thin merino t-shirt in hot or cold (as a base layer) weather because merino insulates your body (form heat or cold) even when wet, and dries incredibly quickly while you are wearing it. None of the new miracle synthetic fabrics out there can even come close.
A conventional SIB would have been an extremely slow ardous, bumpy ride against those waves with a fair potential of flipping it, because of the bumpy nature of a inflatable center keel. The protective rubber strip for the anchor line came standard with the boat.