I suppose this will only interest a microscopic subset of forum members but, if you want to tour and require a cpap machine for sleep apnea it will be of interest.
In the past I've been restricted to campsites with electricity which was expensive and quite constraining so am happy to have acquired (thank you insurance company!) a battery powered cpap machine. It's quite small, about one pound, and the larger available battery is said to last three nights. They have a solar recharge system if that interests you.
If you happen to be a cpap-using bicycle tourist check it out: http://www.mytranscend.com/patients/...pecifications/