You can stop looking. Your doctor and your insurance will determine what you get. C-pap and bi-pap are different types of the same machine. Yes, the machine is about the size of a shoe box with humidity. BUT it doubles in size when you put it in the travel case. Mask, hose, power supply and cord takes up as much space as the machine does. Comes with its own travel case. It's about the size as a women's large purse. I'm on my 3rd machine in 15 years. I don't take mine for one night stands but any more than that and it goes with me.