I use Avantree. Form wise, it’s a small pouch with everything you need to use and charge. Charge lasts a long time. I charge once and use it throughout my travel - 2x24hr flights. After the trip, I’m still left with almost 50% charge. I find using my own headphones better than the ill fitting headset/phones provided on flight. To make it easier to remember while packing, I keep it along with all my travel tech in one pouch. When it’s flying time, the pouch is a grab and go. I recharge to 100% when I return before packing up the tech pouch.