I sleep with my food pack.  All I've ever used is a cardboard box set inside a plastic liner and then set inside a #3 Duluth pack.  The food pack never leaves the tent, unless I am away from camp the entire day and then I take it with me.  Keep the mice out of the tent and keep a clean camp and you'll have no problems at all, at least I never have.  If a bear wants to tangle a couple shots with the .22 pistol will either scare him away or make him attack me.  Hopefully, I will never find out.    

And unless you are carrying a steel safe with you, nothing is bear proof.  My dad was working up the Echo Trail one day and he swung into the parking lot at the Moose River entry point.  Here someone had left a pizza box on the back seat of their car, and a bear put his claws into the top of the car door and folded the door in half, climbed inside and finished off the rest of the pizza.  Whoever's vehicle that was had a big surprise waiting for them.  A clawed up car, a door folded in half, and some nice black fur that the jagged metal tore off.