I was pleasantly surprised by the ease with which the bag inflates - an ingenious system also allows deflate slightly by pressing a button to "settle" the firmness of the cushion. I did not used while sitting, lying down but even I find it more ergonomic than others. And there is a reassuring in this form, you feel enveloped, like one a hug to someone ... brief psychological comfort and more physical comfort, exactly what I needed for my world tour !