Where is a bear canister required on the JMT?

I am hiking the JMT this July. I will carry 1 bear vault with 7-8 days of food between MTR and Whitney. I would like to be on the trail more than 7 days. I have read online that a bear canister is not required between MTR & Pinchot Pass. Is that still in effect? If so, I figure I can put the extra food in my Ursack. Or do I need to carry a 2nd canister?