I saw one reference saying you needed a bear canister in Desolation Wilderness. Â Glad to hear Ursacks are approved now. Â Is the Yosemite prohibition specifically against tying it to TREES? Â Versus boulders, signs, bear cables, etc?
“and I will be doing it without resupply,”
This jumps out at me (because this is PBL) – the route crosses paved roads at (or near) Echo Summit, Carson Pass, Ebbetts Pass and Sonora Pass.  9 days of food and fuel = 18 pounds.  Half of that is 9 pounds.  One resupply lets you drop 9 pounds from the first 90-ish miles of the trip.  810 pound-miles is a LOT!  Whatever shape you’re in, and however good or bad the route-finding goes, carrying 9 pounds less makes it a lot more likely you can maintain your 20 miles a day.  Also, a resupply cache lets you restock mosquito repellent, sunscreen, toilet paper, batteries (or not, if you don’t need anymore) and to leave some heavy luxury foods to scarf at the trailhead.
-1 on the bear spray. Â Sure, the black bears will take any food you let them take. Â OTOH, they won’t take any food you don’t let them take. Â After being a wuss as a teenager on my first Sierra backpacking trip, I decided to always confront them. Â That gets easier and easier with experience.
Times black bears have eaten my dinner: 1
Times I’ve run them off: 4
Time I’ve eaten the black bear as my dinner on the trail (literally): 3