There are many things that should be present in a good backpack vacuum cleaner.

It should be light in weight, with even weight distribution, and the noise level must be as low as possible. At the same time, the power needs to be sufficient for fast, effective cleaning, and the dust bag must be large enough to avoid constant changing. Without these basics, a backpack vacuum cleaner is uncomfortable and impractical to operate. 

The GD5 backpack vacuum cleaner meets these criteria and more.