In particular, what about areas with only a few interspersed black bears throughout a very large area, not common and no grizzlies?

What if you carry all "cold" food in ziplock bags, no cooking to release excess smells?

If you have, for example, peanut butter sandwiches, bagels, and pop tarts sealed inside ziploc bags, inside a food bag, inside your backpack, is that still going to release enough smells to attract bears to your camp site?

It seems like such a hassle to hang up all the food 100 ft from your camp every night, especially in areas where bears aren't super common...