Thank you for your reply's. Cory is currently prescribed Oxygen at night but uses whenever he is sleeping at all and during rough times (after activity, heavy coughing spells). We have the liquid oxygen at home. My concern was that my youngest son is going to be graduating from moot camp in November. We will need to be in San Diego for several days. We have the "stroller" tanks but I can't imagine dragging alone several of them to the Marine base. Or even when he goes to his grandma's for a night. The supplier did tell me that if we were traveling they would set the oxygen up wherever we were but they needed 2 weeks notice. Often it can be a last minute trip to Grandma's (Cory is really close to his grandma's) and the tanks only last 4 hours