The Meshtastic project (Meshtastic.org) offers LoRa mesh based comms. This protocol is ideal not just for off the grid travel and disasters but for circumstances of social unrest where cell service may be disrupted or unappealing for OPSEC reasons. Existing enclosures for the T-Beam board were not up to protecting electronics from significant impacts. These files, printed in TPU effectively shock mount the board within a 50mm clear PVC pipe. I'd suggest *only* using clear PVC to avoid the enclosure being mistaken for a destructive device. The end caps fit on snugly and are waterproof with the spacers, but not so tight they can't be removed to recharge the battery. The electronics should be able to survive being thrown up onto roofs and awnings with a sling as needed to establish mesh points. There's no reason a longer pipe could not accommodate a solar cell and be completely sealed, I'll be happy to make such a version on request.