The problem with making the perfect bear proof garbage disposal site is there is a real big over lap between the intelligence of the smarter bears and stupid tourists.
I used to laugh but the last actual camp site I stayed at had (not dispersed) had a trade can that required the removal of two carabiners and the activation of two other latches to get it open. If one is drinking the proper amount of camping beers, I'd put my money on the bear getting it first.
A couple of years back at the request of wife I set a camp up in Glacier park for her California friends. With the approval of a ranger, I used a steel Knox tool box to store food stuff in. They are not easy to break into, even with big pry bars, but then I watched a video of a bear getting its claws in the the crack at top of car door and literately tearing the door off
Was once fishing at an access on Ft Peck reservoir a huge lake in Montana. Had one of those old metal minnow buckets full of minnows tossed out in the lake on a line. In the morning the bucket was up on beach lid open and bucket empty with coon tracks all over. Got more minnows, added a rock to the bucket and wired the lid shut. Next morning bucket was on beach wire was removed and bucket was empty again. I don't think it was that coons first rodeo and I bet he made a living at raiding bait buckets and stringers.
Skunks are pretty smart to. I had a 1/2 grown one start coming in the shop via the cat door and raiding my cat's food bowl. Cute little guy, who never sprayed me or cat. I locked him out of shop at night and putt out a bowl with some cat food mixed in with dog food for him. He would tip the bowl over and separate out the cat food and leave the dog food. Went away for a few months on a job and never saw him again. I have followed a wild skunk around watching them hunt for stuff. They will just ignore you if you give them some space. They know that most creatures know not to bother them.