Randy has made it a point to nab several empty milk jugs out of the trash, so I finally gave in and started rinsing them out after we're done with them, taking the lid and plastic ring off of them, and giving them to him. He takes great delight in carting them all over the house, and then when he starts chewing on them and making ragged edges, I take them away and replace with a new one.
This is the look/pose I got when I asked him to hand over the last jug in exchange for a new one!