Troubling new images reveal the hellish conditions of a makeshift camp on the California side of the US-Mexico border, where migrants and their kids huddled in garbage bags, begging for food.

The trash-strewn encampment — which popped up between a primary and secondary border wall in San Ysidro, hastily arranged by Border Patrol — is filled with people who were hoping to take advantage of the Biden administration’s end to the pandemic-era Title 42 and gain legal entry into the US.

Since that expired and has been replaced with tougher new measures, their future became uncertain.

Video shot by a migrant for The Post just at 10pm Western time Thursday — an hour after the health-based regulation expired — showed scores of people huddled under black trash bags and tarps which they had attached along the bottom of the razor-wire-topped border wall.

Other somber migrants without a spot along the wall sprawled out on blankets on the dusty ground on the hill a few feet away, some splitting open garbage bags to put over themselves to keep warm.

The number of children in the group is increasing, volunteers told The Post.

US agents handed out water to the migrants but nothing else, leaving the masses begging volunteers for food and extra garbage bags to wrap themselves in to keep warm from temps which dipped into the 50s overnight, observers said.

Some migrants were also desperately asking journalists on the other side of the barrier to help them charge their cell phones.

There were a handful of US Customs and Border Patrol and Department of Homeland Security officers on either side of the border.

The migrants have been given colored wristbands by the US authorities — including some that were blue, red and green — and told that depending on the color, they would be taken to a processing center on that day.

To stay in the US, the migrants still must prove that they fear for their lives in their home countries and tried to get help there but that their efforts were futile.

The end of Title 42 means they can at least stay longer — potentially years — and work while trying to prove their asylum case.