Sabrent 4 Port Mini Portable USB 3.0 Hub [2-ft cable] the World's Smallest USB 3.0 Hub (HB-MNBW)

Good size to carry in your computer bag.  I tested all the ports, all work. Good gadget at a good price. 

·                        Expand by connecting up to 4 USB 3.0, 2.0, or 1.1 devices to any USB 3.0 or 2.0 capable computer

·                        Compatible with all Windows/Mac/Linux systems.

·                        Supports USB 3.0 transfer rates up to 5Gbps. Backwards compatible with all USB 2.0/1.1 devices and hosts

If reviewing a product, it may have been received free of charge. That will NEVER have a bearing on my recommendations.