The standard belt that's included with the g5-01 Is terrible limits your movement especially while doing repairs and welds in tight area's. The backpack makes the papr a million times better can wear it all day and barely notice it plus gives you way more movement, only reason I can't give it 5 stars is because 3m made this product seem like a afterthought rather than a oe option, the on/off button is incredibly difficult to hit while it's on your back, and though the quality seems to be good and durable it leaves some to be desired especially for the price. But at the end of the day I am 100% satisfied and would recommend