Subject: Brilliant solution for travel!
I have the ResMed Air 10 Curve, which is a bi-level machine for those of us with central sleep apnea. Unfortunately, no one seems to make a small, travel size machine. BUT! ResMed makes this side cover, which fits into the area where the water reservoir would go. It blocks all the air from coming out, and makes the machine about 50% smaller than when the water reservoir is in. So now, I can add the machine to my carry-on bag for future travel! (Plus I won't need to search out boiled water every evening!)
(Medicare doesn't consider this item "a necessity," so it's an out-of-pocket expense. But it's only about $15, so that isn't bad. Especially when a travel machine runs about $900!)