This art was originally done by  pacificautumn and you can fave the original artist here: https://www.furaffinity.net/view/29044097/

Had a new idea recently, needed to visualise it out here~ This here bear is based on a wider idea I have. Basically, in a Planet of the Apes-esque situation, bears end up evolving past their feral forms and minds, gaining human level-and-beyond intelligence and their bodies altered to become 9-10ft anthropomorphic forms, usually complete with large bellies. With this 'gift', they opted to overtake and supersede humanity as the dominant race of earth, with bears essentially taking over, running businesses, taking over the world, etcetera etcetera.
For the humans, there is but one fate for them: Being swallowed up by a bear and dumped into their bellies. From there, they'e absorbed into the bear's belly fat, retained their. The soul is held in the fat, kind of like a 'hard drive'. The number of humans/souls kept inside a bear can be gauged by the number of belly tats/marks on the bear's belly. Once contained, the bear can do whatever they please. The 'stored souls' can be released and transformed into bears themselves, to join the new world order, or the bear can opt to just keep them attached to his belly, brandishing the belly tats as a 'trophy' of sorts. That said, the longer a soul stays attached to the bear's belly, the more the 'drive' will try to accommodate them, indicated by the belly tats growing on the belly. Should they grow to encompass the belly entirely, the bear can't 'load' it until he releases what's already inside. So, something like on the image here, the bear can still 'load' more into his belly, but he would have to be quick.
That said, while humans are lower on the food chain now, it doesn't mean that they're treated like food. While a small subset of bears usually hunt down their prey or treat them like a snack, a large majority of bears will usually give the human the best treatment they can, ensuring they're well comforted and entertained before sliding on in. An easy indicator is through the belly and the number of tats they have. An exposed belly and low number of tats/marks on it indicate friendly bears, even more so if they go through the trouble to replicate the tats on any clothing they wear that does cover the belly. Whereas bears that go out of their way to 'hide' their belly, or have a large amount of tats on it, will usually tend to be the kind that'll gulp you down like snackfood.
They also have one more ability up their sleeves, or on their belly ( :P ). The belly itself contains a memetic agent/spore that, when released, will tend to pacify/calm any human down that makes direct contact with the belly. To use this, the bear needs to have one occupant 'stored' away on the belly, as the agent/spore needs a benchmark to release properly. While it can be released with no occupants, it tends to be hazardous to the bear (causing nausea, could feedback, hazy/blurry vision, etc). Also, the more occupants a bear has, the less powerful the agent/spore will be, meaning extended belly contact would be needed for it to take proper effect.

As for vore between the bears themselves: While it is possible, it is entirely non lethal. Worst case scenario, the bear spends a large amount of time within their devourer. Otherwise, most will usually vore each other as some form of practical joke, comedy, casual play or even a term of extreme endearment (even as a form of 'proposal')