Cardboard boxes fitted with insulating material to keep contents cool and cushioned during shipping. The insulation is recycled biodegradable mixed fiber inside a plastic film covering. Used, but in good condition.
You’re welcome to take just the boxes or just the insulating wraps, which could also be used inside a poly (plastic film) mailer.
I also have plenty of gel ice packs to go with them if you want. Take as many or few of each as you need.