O2totes Ultra LightWeight Backpack Fits The Inogen One G4/OxyGo Fit/Lightest Backpack for The Inogen One G4, under 10 ounces WILL ONLY FIT THE INOGEN ONE G4: IO-400

Lightweight design weighing only 9 ounces/For the Backpack Only, Does Not come with O2, must have your own Inogen **WILL ONLY FIT THE INOGEN ONE G4 I0-400. DOES NOT FIT ANY OTHER UNIT Keeps you hands free while wearing your Inogen one G4 (not included) Mesh panels surround your unit (not included) Adjustable backpack straps, removable chest strap for even more comfort This will not work for anything but the Inogen One G4. All Inogen units are called Inogen One, you need to find which one you have, G3, G4, G5