For many campers these days, getting away doesn't mean being out of contact the entire time. If you're car camping, maybe you can just plug your electronics into its power receptacle to get recharged. But if a vehicle isn't a nearby option, here's a lightweight battery pack you can take with you to stay hooked up.
This is the Weego 10400 mah pack that fully charged itself holds enough power to charge phones up to 6 times and has 2 USB ports for dual charging. Keep your phone, GPS, camera, lighting or other electronics working in the backcountry even when many miles from the nearest land power source.
Weighs in at a friendly 12 ounces and is small-sized at 5.8 x 2 x 4.1 inches. Will hold its own charge for many months without draining, so it's safe to hold in re-supply points. Can recharge a smartphone in fast mode in about the same time as a normal wall plug.