There are precious few battery packs out there with USB-C power delivery, and this 30,000mAh model from Aukey is one of the most affordable we’ve seen.
In addition to the two standard USB output ports, the USB-C port works as both an input and high-speed output port that can charge a 12" MacBook at full speed, or charge your Nintendo Switch’s battery level while playing it at full brightness. It’s pretty huge, but 30,000mAh should be enough juice to get power your devices for hours or days on end. Just be sure to use promo code AUPOWER1 at checkout to get it for $54.