My 3-yr old son and I worked on this Bumblebee Transformer costume together for about a month. We enjoyed the whole process of collecting boxes, taking measurements, testing materials, and practicing the transform. We ended up using a printer box and a lot of duct tape to make the sturdy finished product, and could not be more proud. It ended up costing us about $15 dollars in duct tape to make. He can transform and walk around in it surprisingly easily – and he is absolutely in awe of what we created. Thank you for letting us share!