For instance, the back pack vacuums are equipped with shoulder straps and a waist belt that is padded. When you first put on the backpack vacuum, it is imperative that you adjust the belt, so that it fits secure and snug around your hips. You will know if you have done this right, because the straps of the device should easily slip around your shoulders, and should be loose. If you are successful, then you have distributed the main force of weight from the machine off of your back and shoulders, and applied it to your hips.