Our HEPA backpack vacuum and it’s unique design collects so much dirt, dust, and allergens, it was rated at 99.99% efficiency at .01 microns! The Atlas™ comes with our extraordinary Ultrastat™ 3-ply composite filter treated with an anti-microbial agent that provides exceptional airflow even when full, allowing for greater productivity. This exclusive bag is fitted with a durable plastic rim for an airtight seal around the top, and the seams are sonically welded (as opposed to glued). The result is higher dust retention, and a much longer filtration cycle before even getting to the HEPA filter. 3-Position hip adjustment for wider or narrower hips allows the unit to sit more comfortably on the hips with a 10 qt. capacity.