Figuring out what's actually required can be complicated. Sometimes, they basically say "don't feed the bears", and they don't say how to accomplish that. Sometimes they require a bear-resistant container, which included the Ursack
. (Some rangers don't even know what an Ursack is, which doesn't help.) And sometimes, they require a hard-sided canister that they have explicitly approved.
There was a Whitney link on the page I gave you. That link went to your map, but I missed that link. The North Fork is a “please don’t feed the bears” area, but I wouldn’t go without my Ursack.
BTW, I was considering two spots for my campsite on one of my trips this summer. One spot is in Hoover Wilderness (approved canisters only). The other spot is in the Emigrant Wilderness (please don't feed the bears). I think I'll walk the extra quarter mile.