Jesse Dinkel, who spotted the bear Saturday at the San Bernardino National Forest, said the animal first ran off with his iPad-containing backpack and he later captured video of the bear riffling through a family's belongings at a picnic table, KTLA-TV, Los Angeles, reported Monday.
"It was crazy," Dinkel said. "He was really not shy."
Dinkel said the bear took a Tupperware container filled with food back into the woods with him.
Forest officials said bear sightings are common at Jenks Lake.
Dinkel said the theft of his iPad by a bear has brought about a new problem.
"Try getting the insurance company to believe that," Dinkel said.