I've been working with 3M, Avery, and Hexis vinyl for some time now on the hobbyist level. I decided to take my hand at wrapping my Anker PowerCore 26800 - I think it came out pretty well! For those that want to try their hand at this - get a premium vinyl product with rapid release channels like 3M 1080 (what I used here) - have a hair dryer handy, and start with a simple square. Complex edges are quite difficult. Make sure your surface is clean, I use isopropyl alcohol (on alcohol-safe surface) and lint-free cloths.
It will never be 100% perfect on these power banks - it doesn't seem like I can remove the end caps to wrap them neatly, so I'm tucking the vinyl under the edges with a sharp knife. It would look better if I could remove the end caps and wrap the vinyl over the edges.
This took four pieces of vinyl - one for the top half, one for the bottom half, one for the back, and one for the front. I split the top half and bottom half along the seams of the power bank.