Trees

Cartisan used to make a good one that looks like a disposable niccy vape, pulsar does too. They only fit double wide carts though.

For tall ones you'll probably need the classic pen/ecig style batteries. The ones that are just a stick with a socket at the end. That should work with just about anything.

I have Randy’s inspo+. Holds 2g carts and looks like a tobacco vape so I roll with it pretty much everywhere. It also comes with a chamber that you can put regular concentrate into as well