The 3 quart paper bags are designed for the Lindhaus DP-5 (not HEPA) and DP-5 Evolution series uprights. These uprights have a tube along the left side inside the bag chamber. The Filtrete exhaust filters measure 3 1/16" x 2 3/8" and fit in frames on the sides of the vacuum's main body.
For similar products see our list of
Lindhaus Vacuum Supplies.