Let's go a bit further...how about a simple "go" bag for the hastily-equipped clan in a disaster or defensive scenario? I think a simple, cheap backpack with 4x bottled water, an MRE, FRS radio, flashlight, 4 rifle mags, simple cleaning kit (lube, toothbrush, boresnake), couple of those cheap USCG/German made parachute flares, and a poncho.
I can't fully articulate why, but a VS-17 air panel would be a good addition. It makes for a good daylight marker in daylight. Also good for marking an occupied room if hung from the window.
This assumes society has not collapsed and there are folks aloft and conducting CSAR.