With a rolled diameter of only 3.5 inches, FlexPower makes a perfect choice for all your boating, camping, backpacking and portable charging needs. In just 10 seconds you can have your FlexPower solar charger unrolled and charging your battery or favorite portable device using any of our easy to use Plug-N-Play accessories. When finished, your FlexPower solar charger can be rolled back and secured using the built-in storage strap or permanently deployed using any of the multiple metal eyelets found along the edges of the solar panel. Whether your charging your digital camera on a weekend hike or keeping your boat batteries ready to go, FlexPower is the brand of choice.