Review on Unleash Your Inner Fighter: Freestanding Bounce Back Punching Bag For Kids And Adults- Perfect For Karate, MMA, Taekwondo And Fitness by Chris Jens

We like that it's separated in 3 compartments and they all have a very specific purpose. We filled the bottom compartment (that looks like a doughnut) with water and that's what keeps it in place. Then the "trunk" underneath the punching bag is what makes the punching bag come right back no matter how hard you punch it. And then the punching bag you also keep it inflated and it all works PERFECT! We've had it for 2+ weeks and are very happy with it. The quality of the materials also seems good.