Extra gloves, extra goggles, extra socks are my MUST haves. I also really love my heated boot bag which I just got and it's awesome, but I don't plan to fly with it. I don't think it will fit in the overhead compartment. I have never needed a boot dryer but I have a travel set that I use to heat my boots in the morning when I travel and will continue doing so. I always have hand warmers in case I need them. I also keep powder ribbons in my boot bag. I lost a ski once and never again want to waste a powder day looking for my ski.