Shoulda brought those REI rain pants, man! We already know the basics of packing for a plane ride—and getting some sleep on that flight—but what about the packing essentials that nobody tells you about in packing school? Fictitious degrees aside, there really are a lot of things you should probably be bringing with you when you’re traveling—especially if you’re going to be gone for a while. We’re talking rain pants for unexpected, well, rain, and trench coats for when you need to stand on top of your buddy to get into the rated-R movie. Did you know rain pants exist?