Directly from the UPS:
Pop Popcorn. Then Pack. That’s right. UPSer Mimi Millegass, a preload clerk in Myrtle Beach, S.C., says, “You have to pack the popcorn down really tight. When the package has arrived safely at its destination, the used popcorn can be thrown outside to feed birds and other animals.” —— I never thought about it but it is an obvious material to pack and is super eco friendly…. those Styrofoam peanuts and bubble wrap are terrible for the environment. I might suggest to make sure the recipient is OK with this and that the item being shipped is securely packed inside a sealed bag or plastic of some kind.