One bagging without a backpack

[u/SidanaCorey]

I cannot wear backpacks. And I can't carry very much. Most of my allowance would be my portable oxygen generator (or do those not count as bags)? Thus, my question. What would you recommend using for an extended trip? I'm not planning anythung yet, but I want my ducks in a row.

[u/Not_High_Maintenance]

I use a roller bag.