When I travel there are a few tech items I always take. The first thing I pack is my super comfortable, noise cancelling headphones. They make flights a little less disruptive and aid sleeping on the plane (something fairly difficult for me).
The second thing I pack is a Bluetooth speaker. I have a small, but good quality unit with good battery life. This lets me have music or podcasts playing without needing to wear headphones both in the office or in the hotel room. Related to this I always ensure I have hours of podcasts and music available offline!
I also always have a tablet in addition to my laptop. This allows me to read more easily than from my phone and more comfortably than on my laptop. It also gives me the option of watching YouTube videos (I've yet to subscribe to Netflix). Thinking about that, it would be great if hotels put a Chromecast on their TVs do I could watch on a larger screen. I do this a lot when at home.
I also toss an external battery end memory sticks in the pocket of my bag. Mostly there don't get used but it is frustrating when they would be helpful but I don't have them.
Lastly, I often take a second phone with me. This depends on how long I'll be visiting somewhere but is often a money saver. Getting a local prepay SIM can be a lot more cost effective than having to pay the roaming charges on my normal mobile phone. It also means I have a local number which is helpful if I'm visiting people and need to be in touch. Of course increasingly digital and messaging apps like WhatsApp eliminate this need.