Pixel XL wall adapter to charge a USB-C power bank

[AC Question]

Reviewed recommended power packs for Pixel XL. Needed to power Pixel XL on trip to Iceland in August. None of the Pixel XL recommended power packs discuss wall adapter to charge the USB-C recommended power bank. All recommendations, to me, assume power pack is already charged or just a USB connection (not a wall outlet) is needed to charge it. This assumes I will have a USB connection of some kind in Iceland. I will not. Just will have a Canon camera and a Pixel XL phone. Are there wall outlet adapters available for the power banks compatible with Pixel XL USB-C technology for any of the recommended Pixel XL power banks?