Mi Power Bank 2i have been absolutely amazing! Its been 4 years now since I am using it. The best thing about this powerbank is, if you charge the powerbank full you can later use to charge two phones of yours even if the phone battery is completely drained out.
Also this powerbank is not to heavy to carry. Tge body of the power bank has a satin finish to it, due to which you have got chances to drop it more often. But I have been now using it for 4 years and I completely suggest you to invest in it.