Toddler and newborn

How do y’all go places with both at the same time. My 3 yr old likes to run away at the stores so idk how I’m going to do it with my newborn in a couple of weeks. Do y’all have a double stroller if so which one. Or do y’all just use one stroller for the newborn. I wanted a bassinet stroller but I also might just need a double one…

I was thinking of a backpack leash thing too but I’ve heard some people judge those n talk bad about people who use them 🙃💀