something like this? https://www.amazon.com/Coleman-3000001495-Cooler-40Qt-Cold/dp/B009JPBRYU

technically speaknig you're supposed to have any weed you're transporting in a locked container unreachable while you're driving (in trunk, for example), so you'd have to get creative with the wiring, but this (or something like it) would probably work for you. You'll have to make sure you keep your jump pack nice and charged though, because it'll wear down your car battery pretty quickly.