It makes you wonder if the manufacturer is testing in real life, that you and me? The conclusion would be quick: not work!
For me it was very clear: as is, for my garden, that does not make me service; I fired the fins!
Now walks very well: while continuing to aspire the bag is full, well packed! It is limited by the weight to lug forcing to empty the bag. This is so exactly what was expected by purchasing a leaf vacuum.