A couple of small things that have come in handy for me during extended travel:
• A hook/carabiner like the Heroclip. Helpful to hang a backpack on a hook or over a bathroom door so you don’t have to set it on the bathroom floor while taking care of business.
• An HDMI adapter that allows you to connect your phone/tablet/computer to a TV. I just watched a movie with my wife and some friends on a laptop instead of the TV for want of this adapter that probably weighs 20g.