Well I don’t know how you get a bear into a box, but I know how you get a bear into a jar
Obviously, the bears need to start thinking outside the box.
You gotta bait it with hunny.
And because they know they can just wander over to the nearby tent, slice it open with their razor sharp claws and eat the chewy deliciousness inside… 
I just spent a week in grizzly country with some friends backpacking and we took appropriate precautions (trail has no bear boxes). One guy owns three bear canisters so we brought those, used them to store as much as possible about 100+ feet from where we camped. Did all of our cooking there. We used a hangline (toss nylon line over a high branch, hoist everything that’s not in the canisters so it’s at least 10 feet off the ground). Keep the campsite clean including eating utensils, etc.
You can rent bear canisters at REI and other backpacking stores.
I learned my camping up in Yosemite where the black bears are an incredible problem so I’m probably more particular about the details than in other areas where the bears aren’t as aggressive. In Yosemite you do not keep anything with any kind of odor out in the open - sunscreen, soap, lip balm, old food wrappers, etc. It all gets locked in the bear lockers. It most definitely does not get locked in a car as the bears will open your vehicle to root around. They have learned what coolers and so forth look like, even under a blanket. If you haven’t seen video of a black bear breaking a car window (or peeling the door right off), climbing in and crawling around to come out with a loaf of bread in it’s mouth look on youtube, it’s quite amusing.
We also carried bear countermeasures (bear spray and .454 Casull) - that’s where grizzlies are concerned, never done it while with a group in black bear country although I might if I was by myself or just with one person. I prefer spray to a gun, it’s evidently more effective and I’m just more comfortable with it.
Keep things clean and unavailable to bears. Once they start associating human beings with readily available food they become increasingly aggressive and problems start, that’s how Yosemite got in the condition it’s in.
Yosemite in particular got that way because feeding the bears used to be a staged event. The park service had bleachers at the garbage dump so people could watch the bears every evening when they emptied the garbage cans from the restaurants in the valley.
It depends on where exactly you’re camping. There are some campgrounds in Lake Tahoe where you pretty much have to climb over the bears to get to your site. Get a little farther away, though, and the bear box may not be necessary. We just spent last weekend camping near (ironically) Bear Valley, which is a little ways south of Lake Tahoe. They don’t have bear boxes either, but we’ve been there a half dozen times and never seen even a whiff of a bear, so it’s clearly not a problem.
Try to find out where the nearest ranger station is and give them a call – they’ll know for sure if you need to mess with bear cans and tying your food up or not.
Yup.
Pffft. I’ve run across three so far. They’re great big cowards, really. They can eat your face if they want to, but they’d rather run away.
The ‘haul the food bag up the tree’ method works for us!
I perused YouTube to see if they had any footage of bears peeling open car doors (which I’ve seen happen before)
Never underestimate the stupidity of the human race to run up to a dangerous animal for the sake of a good close photograph. Ugh.
We camp & archery hunt in areas where black bears have learned to be wary of human scent. The few times we’ve come across black bear, they rocket off like they’re on fire and won’t stop until they’ve gone a few miles.
That’s not all that far from where I bear hunt. I guarantee you that there are bears there (I know others who hunt that area) but they just might not be a campground problem. Unsurprisingly, we don’t have a problem at all in our camp. 
edited to add: ArchiveGuy, that’s close to the Rubicon Trail. You might want to do a little research to see if they have an event going on the weekend you’re planning on going. It might influence your decision, based on your fondness for off-road vehicles. My husband was jeeping up there a couple of weeks ago, and he said the trail itself was a stream of never-ending traffic. Slow traffic rolling over rocks, but still a lot of people.
Yeah, that pretty much sums up the astounding level of stupidity of many people around wild animals. The vehicle owner just learned a lesson the hard way, a number of people were in immediate danger, that bear got a better idea that cars & people = food to be had, and thanks to all those idiots crowding around, the bear is probably less scared of people now which may lead to more aggressive behavior. I’ve been in areas where the park service has had to destroy bears because of this.
Go to Yellowstone during tourist season if you really want to see morons in full bloom regarding their interactions with large animals.
Sorry. Ranting.
In the White Mountains of NH where I do most of my camping, hanging food is usually enough. The real threat is from mice and the like. A few shelters have bear boxes, but it’s the exception not the rule. None of the car camping spots have bear boxes, cars are fine here.
In the Adirondacks, I will take a bear canister. It’s required in many places, recommended in others. I’ve had bears figure out our properly hung food (they even figured out one the bear canisters which is no longer approved for use) and it’s just not worth the trouble to try and hang in the places where it’s still legal.
For car camping you’ll need to buckle down and get a canister or two. They are available for rent as someone above mentioned.
As to why camp in bear country, pretty much all of the mountains are bear country. It’s just a matter of mitigating the low but real risk.
Heck, you and your friends are probably why we don’t need bear boxes. So, thanks! 
Just don’t eat their porridge.
Duh! Just don’t bring any food! Bring a gun. (What’s a good caliber for bear?)
If the box is big enough, the bear puts itself in it.
Up north of the border, we’re all laughing at you.
Just sayin’.
I keep wanting to read the title as ‘Camping wino beer boxes’.
Remember, down here the bears have guns.