When choosing and packing tech gear it pays to be absolutely ruthless. It is tempting to throw a few items in to your pack that you might occasionally use. But they end up just adding considerable weight for marginal utility.
I do understand that many travelers have specialized hobbies and desires. Some might be earning a living as photographers, or managing hedge funds, or landing space rockets. For these great and good people I know that this list is not going to meet your needs. For the vast majority of others I advise you to leave the tripod, selfie stick, drone, power strip, laser keyboard, travel speaker and portable projector at home; or at least gift it to someone at your hostel three months in to your journey.
Here is my current list:
Outlet adapter. There are a ton of choices available, but many of the ones that (uselessly) convert voltage are bulky and heavy. I carry the amazingly light (45g), compact and cute Kikkerland product. Combined with a two USB port adapter this has worked everywhere (except South Africa).
Noise cancelling headphones. Bose. Heavy and bulky (240g after discarding the protective case) and spendy at $300, but absolutely essential. For watching movies and listening to podcasts in the evening, quieting the regular calls to prayer from the mosques, tuning out the endless conversation behind you on the flights (download a white noise app like Sleep Pillow), surviving the long bus ride from Arusha with crashing music (be sure to have a comfortable set of eyeshades to help you sleep). This is a pure quality of life item.
Over the ear sports ear buds. For podcasts and music on long hikes and city walks. I chose cheap, discreet black ones from JVC (discard any carrying case, nets to 15g). They do take a beating and need to be replaced perhaps twice a year.
Two iPhones. Identical models, unlocked. One on T-Mobile plan, other on Google Fi. No protective cases or add ons.
Phone battery power case. Mophie (at 100g the lightest I could find) as backup for phones. This doubles as ‘phone armour when I am silly biking.
iPad. Large internal memory for a ton of movies (and a couple of addictive infantile games). Connected to Google Fi data plan. No protective carrying case.
Keyboard. The ridiculously cute folding iClever products. An absolute joy to use. Seriously, it makes me smile every time I unfold it. 185g.
Charging cables. You are as frustrated as i am about fumbling around in the dark and switching charging cables. Get a set of rotating head magic magnetic cables and laugh all the time.
Display kickstand for phones and iPad. IMangoo (sketchy hyperlink). 10g. Perfect design. Update. Splurged a few bucks on a heavier version.
A note on charging your gear. Many hotels have a wall slot just inside the room door, into which the card key is inserted to turn on the power in the room. Thus when you leave (and take the key) electronics that are plugged in stop charging. Ask for a second key when checking in so that you can leave one in the slot. (In Thailand they demanded a $70 deposit for a second card). I also carry an old credit card that, if extra keys are not available, sometimes works to activate and keep the power on while I am out of the room.