DIY Cobra Bag for $20 Including Base

How to make a reflex punching bag at home similar to the Cobra bag, but without the complexity or the cost. Super simple to make and the complete build including the base is all around $20. Read the step-by-step instructions on my blog: www.fighterdiy....
Update: See my DIY channel transformed into a global brand producing the world's first modular cobra bag: kewlus.com/