As Bill says, keep anything that *looks* like food out of sight.  The other
day
a car was totalled in Yosemite because the ownre unpacked his Coleman ice
chest
into the bear box, and then put the ice chest "away" in the back seat of
his car.
Dumb, dumb, dumb.  Bears can READ.  "Coleman" and "Igloo" are their
favorite words.

Once, we parked next to a big Chevy Suburban.  A bear ripped the door off
'cause
the guy used an empty Campbell's Soup can as a catch-all on his dash (I guess
he was making an Andy Warhol statement).  Things that LOOK like food or
smell like
food attract bears, but most cars in Yosemite smell like food to bears, so
sight
appears to be more important in the valley.  The bear did not bother using
the
door he ripped open to exit -- he simply ripped open another, so this guys
urban assault vehicle was *really* trashed.

Have fun camping.

Malcolm H (8 years a Yosemite ranger, and still living nearby -- we get stray
bears even at home...)