Amazon offers the Aukey 10000mAh USB-C 18W Quick Charge 3 Power Bank (PB-Y13) for $18.09 shipped after you use the $5 clippable coupon on Amazon's page and apply coupon code "ND4Y3IP8" at checkout. Note, generally you need to be logged into your Amazon account to see clippable coupons.
Aukey 10000mAh USB-C 18W Quick Charge 3 Portable Power Bank comes in a slick smallish design that's easy to take on a trip. The Quick Charge 3.0 port charges compatible devices up to 4 times faster than typical charging. This is sure to work great with Apple iPhone 11/11Pro/Xs/XS Max, Google Pixel, Samsung, Nintendo Switch, and many other devices.