I'm currently using an old charger like this: 
It's great. Easy to carry with me, uses a two-pin cable so I can easily buy a cheap 2 dollar cable in the country I'm traveling. It's light, and I use a few short (30cm) cables to charge my laptop, phone and other stuff.
I would like to get another one, but it seems like they are no longer sold from the original manufacturer.
I'm searching around online, but the only alternatives I find seem to be very bulky and not easily carried with you. Or they are wall chargers, which is very inconvenient, needing 4 long cables to reach your devices, and often taking up multiple plugs because they are so bulky.
Anybody that knows if these are still sold anywhere? This one is 65W, but with GaN tech, I expected to see more of these compact chargers with the same weight and thickness outputting maybe 100W. But I can't find anything
I don't know if there's some difference I'm not picking up on or if it's a location thing, but it looks to me like it's still being sold
https://www.anker.com/products/a2046
https://www.amazon.com/Anker-Charger-4-Port-MacBook-Laptops/dp/B098WQRGNQ
Otherwise yeah I'm not really finding a similarly travel friendly charger with replaceable cable, especially not in 100W
Yeah, seems like they are still selling it, but not on the official website or on amazon in my country. The selection from anker seems to differ wildly depending on the country