I don't think HEPA bags are worth it as everytime I've received a HEPA bag in a Kirby I buy, it always ends up torn and spilled even if it's almost a brand new bag. I don't know if that's a Kirby thing or what but I rather spend money on my paper bags then be worried that the bag would be ripped. I'd like to buy the HEPA bags but I'm just afraid to after what I've seen.