Hi All, i am about to launch myself on a 70+ day RTW trip that I am/was thinking of doing it using carry-on luggage only. i am a male, with some medical issues (need some pills and a CPAP machine to carry for example), looking to take one or two changes of basic clothes - shorts and polo-like shirts, and minimal camera/electronic gear. am going on this route - mainly with AC, LH, LX and TG for the inter continentals (all in Business), and United around the US (business again) and Asiana for an Asia Air Pass - in Economy. i am just looking for comments, tips, experiences from the wise collective that is AFF please ? I am now thinking of taking a checked luggage bag, so i would appreciate any ideas please ? do many people do a trip like this with carry on only, or it is a bit impractical ? i have prepaid everything - except for food and misso souvenirs and minor transport. i will be staying, touristing in urban areas only thank you if anyone has any ideas.