It works perfectly. After about 1 hour of continuous use, the hand gets tired and needs a break, but it works effectively and is very easy to assemble.

It is not worth the money it costs.
Back straps that do not hold securely.
The tube that connects to the back container exceeds the slightest resistance and you have to take off the backpack every time to put it back on.
The lever arm that fills with air needs to be unscrewed every time you store the backpack, otherwise it will fly vertically.
Finally, usage instructions are ONLY in Spanish, unacceptable.