We went to WDW when my daughter was 2.5yr old and rented a "portable" oxygen concentrator for her from our med supply company at home as we fly down. They gave us the Oxlife Independence and it is so big and heavy that it ripped the basket on our Baby Jogger Summit. We are looking at buying one outright this time so we can get a smaller one and so we can have more then one battery. It must have continuous flow. Our daughter is currently on 3/4lpm but I know none of them do that so we will probably just have to bump her to 1lpm while we are there (she was only on .5lpm last time we went). I want one that is small enough to fit in our Baby Jogger City Select double basket as there is no way to wheel one and push a stroller at the same time and we also need a place to put two feeding pumps.I'm looking at the respertronics SimplyGo. Any opinions? Thank you so much!