agree on avoiding the peanuts, they might be the biodegradable kind and then where would you be?
have used empty 4-inch pots, empty gatorade and powerade bottles, and soda cans. did not like the results with the cans when i emptied the pot later. the pots seemed to work best for me.
do you want to keep the pot lightweight? maybe folded up bubble wrap? would leave space along the sides for drainage. have any flat volleyballs, beach balls, or basketballs? recycling is good.
