I go between Asia and Europe a lot for work and the thought of carrying around a lot of adapters is a nightmare. This has worked perfect for my laptop, curling iron, phone and travel dryer in every country I've been in. It's light and very easy to use.
Travelling outside of America has stricter limitations on liquids. If you can fit your liquids into this, you can get them through security really easy. Plus this fits into a purse for easy screening access. Flight 001 Clear Carry-On Quart Bag (S) (Clear)
I use this for all my in-flight essentials like headphones, chargers, eye mask, snacks etc. It's in my purse so it's easy to take in and out but I store this with me on my seat so I don't have to worry about losing things in random pockets or not having something with me whilst flying because I put it in the overhead bin.
Kenu Airframe Portable Smartphone Car Mount. I couldn't tell you how much this changed road trips for me! It clicks in easily into your vents, fits ANY phone width and allows you to easily see your GPS or music whilst driving.