This post aims to help you put together a solar powered communications system that will fit in a backpack from products that are available online. This setup could prove it's usefulness in a variety of situations from wilderness expeditions to disasters. 
The system I'm describing consists of a power bank, portable solar panels, goTenna mesh, and smartphones.
Solar panel: https://lifepower.be/product/sun20c/
GoTenna mesh: https://gotenna.com/pages/gotenna-mesh
Pair to your phone and create your own signal. goTenna Mesh lets you send texts and GPS locations, no service required. Revolutionary mesh networking privately and automatically relays messages through other devices to extend beyond point-to-point range; the bigger your network, the stronger your communications.
These aren't affiliate links, I just want to spread my enthusiasm for self sufficiency and cool tech. Having items like this will make people more difficult to control and manipulate.