Grab 1 of these shredder bags to efficiently collect the shredded material from your Ativa 450 Series machine (sold separately). With a 1-mil thickness, the bags provide a strong hold. Shredder bags are sturdy enough to hold all of your paper shredded material. Choose a bag that fits your Ativa shredder. These shredder bags are designed for 450 Series machines (sold separately). Shredder bags are 1-mil thick and come in a box of 50 bags. Ativa is a trademark or registered trademark of The Office Club, Inc.