I've been using retractable USB-C cables with as many compact "connector-size" dongles as I can get my hands on.

https://www.amazon.com/dp/B0FC1HSS9X/ for RJ45/Ethernet - these are super small and deliver full gigabit speed, for instance.

Similar things for video (tiny HDMI male adapter), and even my walkie-talkie (the Chinese market has come up with Motorola programming cable adapters that are just little dongles - https://www.ebay.com/itm/800104798120 - I can reprogram and even reload AES256 keys into my radio!).

PD triggers let my travel CPAP run off of battery (using a Transcend Micro - it only needs a 19V PD trigger and a solid 100W).

And of course... an Ecoflow solar hat and a battery I can shove in my back pocket for when I'm wandering around in the open air.

... and I just realized I can hook my Sony Reon Pocket cooler up to the solar hat...