battery dies while camping

Hi all,

We go car camping a few times a year and the battery always dies. I've turned off all the interior lights for when you open/close doors. I've tried leaving the hatch open all weekend so I don't need to open/shut it. I worried that was draining the battery so I've tried keeping it shut and only opening as needed. It doesn't matter. I have to get a jump every time.

Any thoughts on what I could do differently? 2022 Outback with the 2nd lowest trim package.

Thanks!