Everlast "Powerlock" speed bag - anybody tried this?

[Tim]

I gave up on Everlast speed bags 10 years ago. BUT this new(?) model claims POWERLOCK: "Its unique Powerlock technology makes it easier than ever to adjust the bag's tension, so you can customize the intensity of your workout."

Any body know how it works? Is it just marketing hype?

https://www.everlast.com/powerlock-speed-bag

[Dutchman]

I don't know, they say it's actually made out of leather. The only way I can figure you can adjust it is by varying the air pressure. Not exactly a new idea.....