We have introduced several portable universal adapters with one or two USB ports. But if you have more USB gadgets need to charge, the following USB power strap should be more suitable for you.
This is a portable power strip that measures 1.1 x 4.4 x 0.75 inches, and designed for USB devices. As we can see from the images, there is no any standard outlet on the unique power strip, but the four integrated USB ports allow you to charge multiple USB devices such as iPhone, iPod touch, iPad, Android tablet and more, and the accompanying covers protect unused ports from dust. Apart from that, the USB power strip has an On/Off switch and 3 foot long USB cable, and the portable design allows you to put it into your laptop bag with ease.
The power strip for USB gadgets is priced at $9.99 USD. If you’re interested, jump to ThinkGeek for more details.