But there are also leftovers. For every six tons that passes over the facility’s conveyor belts, one ton doesn’t belong in any of those bales. Cardboard is welcomed, but not greasy, cheesy pizza boxes. Plastic containers are OK, but if they have too much yogurt or peanut butter still inside them, they could foul an entire bale of plastics. Paper is the biggest resource, by weight, but if it’s shredded and dumped into the recycling bin, it just gets stuck to glass bottles.