From the Inyo National Forest website:
"In eight specific areas it is mandatory to store food and refuse in a container designed to prevent access by bear.
Bear-resistant food storage containers are required in the following areas in Inyo National Forest:
Bishop Pass Area,
Cottonwood Lakes Basin/ Cottonwood Pass Area,
Duck Pass / Purple Lake Area,
Fish Creek Area,
Kearsarge Pass Area,
Little Lakes Valley Area,
Mammoth Lakes / Rush Creek Area,
Mount Whitney Area"