10. Top off all your electronics with a portable battery for those times that you get a seat without a plug.
19. Swap out your laces with stretchable ones so you can scoot by easier in the security check line.
20. Shut out all lingering light with a sleep mask for when your window partner won't put down the damn shade.
21. Roll all your cables and electronics into a single organizer so you don't have to dig through your carry-on.
Reviews here have been edited for length and/or clarity.