The Inogen One G4 gives you the ability to carry the unit around with strictly the shoulder strap, by attaching it directly to the sides of the concentrator.
However, you spent a pretty penny on this portable oxygen concentrator and will want to extend the life of the machine for as long as possible.
The most effective option to do this would be to use the Inogen One G4 carry bag. Which will provide protection from bumps, scratches, and minor drops by providing a layer of padding.
What’s more, is the Inogen One G4 carry bag gives you multiple carrying options.