The LightCap 300 is an ingenious solar-powered lantern that’s built into the cap of a BPA-free water bottle. More than 25,000 units of the original LightCap were sold. This new version features four super bright white LEDs, 40% more solar panel output (which means faster charging) and a more light weight construction. The cap is made from rugged polycarbonate. A swivel retaining ring has slots and holes for easy hanging. You can find the LightCap 300 for $29.95 on the SoLight website.