https://www.amazon.com/gp/product/B00VLNT9KW/r?tag=hawk-future-20&ascsubtag=UUacUvbUpU5548712
Anker 20000mah with QC 3. Anker makes amazing quality products.
Ive been using it for about 3 months now, couldnt be happier. Easily fits in to your pocket as well as long as you're not wearing skinny jeans.