Hi ya'll!  An additional age-related challenge for me.  I now am the owner/user of a CPAP (continuous positive air pressure) machine.  It's used to alleviate sleep apnea.  Overall, it will be a good thing as I have been getting only about four hours of real sleep a night over the past couple decades and that takes a toll over the years.  I will have lots more energy to explore and walk due to the therapy.  The one I got weighs about 6.5 pounds (around 3 kg) and comes in a briefcase-sized case.  It appears to be dual voltage (110 VAC/ 220 VAC) so I will probably be able to use it with an adapter should I be lucky enough to travel to Europe again (still working on that travel aspect).  But there is no way I can fit it into my backpack so I have to now modify my one-bag methodology and I will no longer have both hands free while traveling.  That will increase the weight I will be carrying to just over 31 pounds (around 14 kg).  It's my understanding the CPAP won't count against my carry-on baggage limit, though, so that's a positive.  The real positive is that I will finally get restful sleep and will be able to get more out of any travel now that I will have more energy.  Anyone else out there with a CPAP that can give us all the benefit of your experience traveling with it?