This is cool until you realize it’s just someone’s old leftover electricity. You could eat for free if you worked at a restaurant and ate table scraps too.
It’s usually multiple foldovers of semi rigid plastic similar to most water bottles around here. They seem to function well. It’s probably six or more 1 litre bottles worth of plastic though.
better but still bad. hope it blows up in their faces in ways worse than i can even imagine.