Huh, I've actually been wanting something like this for my Macbook for travel (since the USB-C cable is charge-only anyways, it doesn't do me a lot of good for it to have two ends -- I'm not going to be plugging it into untrusted USB ports to charge anyways). Compactness is much more important to me. Will have to see what people say about the durability though.

EDIT: Of course, the wattage is too low, so no dice anyways.