Battery packs and power banks are great, but what if you don't have anywhere to plug in and your power bank loses juice? That isn't an issue with this solar power bank that charges via solar power panels on the front of the unit. It's also waterproof so you don't have to worry about damaging it during your travels. If it gets wet, no big deal. The rugged outer exterior also helps to prevent some damage from drops, and the included carabiner hook makes it easy to clip to the outside of a pack so you don't have to store it in a pocket leaving you more room for other important things. This power bank also comes in a variety of colors including yellow, green, and blue. It's also dual-USB so you can charge two devices at one if you need to.