I discovered canvas "tramp" shoes while a friend was attending clown school. They're light, comfortable, easy to take on/off (the tongue/heel are elastic), and wonderful for travel, especially on longer airline flights. The entire sole is a thin, very flexible rubber that's great for slippery surfaces (and turbulence), and fine for in-flight restroom-stepping. Since they can be rolled up, the shoes are rather pack-friendly. In addition to the previously-reviewed Lights Out Sleep Mask and a pair of Smartwool socks, these are at the top of my carry-on list for upcoming flights to Japan and Buenos Aires. They're available in other colors. I went with white. They look just like the anti-gravity booties worn by the Orion III flight attendants in 2001: A Space Odyssey!