Did you know that some packing peanuts are plant based and not the environmentally unfriendly styrofoam peanuts? If you receive a package with packing peanuts you can perform a water test to see if they are biodegradable and not styrofoam. The packing peanuts seen here are from Storopack and they are made from plant starches. They are compostable in commercial facilities (but that never stops me from adding them to my home pile), they leave no harmful residue, and they disintegrate in water with