About product and suppliers:
            8,450 usb power pack products are offered for sale by suppliers on Alibaba.com, of which power banks accounts for 36%, lithium ion batteries accounts for 2%. 

A wide variety of usb power pack options are available to you, such as double usb. You can also choose from micro usb, usb, and dc usb power pack, as well as from waterproof, ultra slim, and fast charging usb power pack, and whether usb power pack is universal, for usa/canada, or others. 

There are 8,450 suppliers who sells usb power pack on Alibaba.com, mainly located in Asia. The top countries of suppliers are United States, China, and Taiwan, China, from which the percentage of usb power pack supply is 1%, 99%, and 1% respectively.