Easy to make with recyclables you may already have!
Step 1: Create the backpack from cardboard and webbing!
Build arm straps like a back pack. Through the top and around to the side. I used old backpack webbing and just stapled it in place to create arm holes! I added a strap across the chest that is stapled to the arm loops and buckles in front. It's like the rocket stabilizers. :)
You could use old webbing, shoelaces, or rope, braided yarn, twill tape...anything you have on hand!
Step 2: Soda bottles become Jet turbines!
Lightly mist them with silver spray paint. Because you will be gluing these to the cardboard, you only need to mist the tops and sides of them, not all around. It was hot out, so it didn't take long to dry!