Atrix International Backpack Replacement Air Purifier Filter in Black | 1.5 H x 9 W x 12.5 D in | Wayfair (1.5 H x 9 W x 12.5 D in)
Atrix Backpack Series 1.5 x 5.25 HEPA Filter (BPFILPACK) | Quill (1.5 x 5.25)
This product is also available at 1 unverified merchant.