If you are looking for HEPA U bags, then check these bags: https://www.ezvacuum.com/electrolux-type-u-upright-vacuum-bags-9-pack-with-hepa-h-10-5-layer-filtration-vac17.html
Its 4 layers of microfiltration paper bag
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If you are looking for HEPA U bags, then check these bags: https://www.ezvacuum.com/electrolux-type-u-upright-vacuum-bags-9-pack-with-hepa-h-10-5-layer-filtration-vac17.html
Its 4 layers of microfiltration paper bag