Yoobao 12,000 mAh Slim Battery Pack
As a perfect middle ground, we found a nice 12,000 mAh slim portable battery charger. It's more than a 10k without being too thick, and it's not massive like the 20k we mentioned earlier, it's right in the middle.
With 12,000 mAh of power, you can top off most phones around 3-4 times. This little battery pack is a hair thicker than the iPhone 11 Pro, and has two USB ports so it works with any device that takes a USB cable. Give it a try.