I dunno, maybe there are other nerds here.
The following items have reduced a big bag of cables, batteries, and wall chargers to a svelte configuration of a single case and a small brick in the wall charger pocket of my laptop rucksack while offering more flexibility and capability of keeping my stuff charged, which is great for travel and off-grid excursions.
Aukey wall charger 
I use this to charge my laptop and other things that require significant power, and to wall charge any other device. The USB-C Power Delivery (PD) port is 46W and it charges my Dell ultrabook quickly. I can also use it to charge my Pixel 2 quickly. It also includes a QuickCharge 3.0 USB port for charging compatible devices rapidly, and then a standard USB port for charging pretty much any device. The flexibility of this has made it a great travel replacement for a couple of wall chargers, including the one that shipped with my laptop. Recommended if you are trying to reduce your travel load out.
SpecificationsInput: AC 100–240V
USB-C Output: (PDO) 5V 3A, 9V 3A, 12V 3A, 15V 3A, 20V 2.3A; (PPS) 3V–21V 3A
USB Output 1 (AiPower): 5V 2.1A Max
USB Output 2 (Quick Charge 3.0): 3.6V–6.5V 3A, 6.5V–9V 2A, 9V–12V 1.5A
Total Power Output: 74.5W
Dimensions: 100 x 77 x 31mm / 3.93” x 3.04” x 1.2”
Weight: 218g / 7.69oz
Anker PowerCore+ 26800 PD with 30W Power Delivery Charger
The PowerCore+ can rapidly charge my Pixel, can drip charge my laptop to extend the battery, can QuickCharge compatible devices, and can fairly rapidly charge any other device. The battery lasts a lot and is great for extended trips and camping. I also use it around the house when I want to charge my phone but don't want to be anchored to the wall.
The wall charger is great because it can juice up this massive battery in about 4 hours--a normal charger would take maybe 5 times that length of time to do so. It can also rapidly charge my phone, and can charge other devices if I need an additional wall charger.
Just under 100Wh so no TSA issues.
Only gripe is no pass-through charging (charge while being charged).
SpecificationsProduct Dimensions 6.5 x 3.1 x 0.9 inches
Item Weight 1.27 pounds
Dual 5V/3A USB ports with PowerIQ
Single two-way USB-C port with PD
Carrying case for the battery and charger above
Padded, secure, and helps with cable organization. Where they have an iPhone in the above image, I keep my 3-in-one (next item below) and other cables. I'll often zip 3 sides of the case and have cables snaking out of the top to charge items--the case zips from the correct side to do this. I keep a thick rubber band around it so that I can attach devices that I'm charging to the exterior of the case. This is the largest of 3 sizes offered and can only fit into the main cavity of my bag, unfortunately.
LinkOn Multi USB Charger Cable 2m/6.6ft/6ft Universal Adapter Cord 3 in 1 Nylon Braided,Type C,Micro and lightning
Long cable that can allows me to use my USB ports to charge anything (does not support rapid charge for USB-C).
