It's about Time. The most comfortable and quietest backpack Sanitaire has ever built. With its load dispersion technology and comfortable harness designed for comfort, balance and heat dispersion, the Quiet Clean HEPA Backpack results in less user fatigue, reduced turnover, and greater cleaning efficiency. At less than 63dBA, the QuietClean BackPack Vac is ideal for cleaning locations where noise needs to be kept to a minimum. A large assortment of tools and attachments help clean every surface.