Another weak point is the weak point of this product. The diagrams could have been more clear. The pictures and the text are on different pages and one had to keep flipping the pages back and forth while reading the instructions.
The unit arrived in 3 parts. I messed up putting it together: I put the exhaust bag in the wrong orientation (with the bag pointing forward, rather than pointing back). Unfortunately it got wedged in that position, and taking it off felt like it would break the unit so I left it this way. Which means I cannot put the strap on my shoulder and it is a harder to empty. I hope my mistake will be an alert to other folks.
You can find it on Amazon by following this link.
Ali Julia review ★★★☆☆