Also basic medicine/medical supplies. It's a staple plotline in apocalyptic fiction but it seems legit for any natural disaster or major civil unrest as well. Whether you're stuck out in a remote location for safety or in the middle of the aftermath of a natural disaster, having a good first aid kit and a supply of medication could save the life of you or someone else in need.

The only bit that seems difficult (but again, this is from apocalyptic fiction so grain of salt) is that so many important medications like insulin, antibiotics, and strong painkillers can't just be purchased at generic wholesale and kept for use or trade in major emergencies or times of real hardship. In the stories it's always the pharmacies that get looted first and there's always some chapter or episode where a family member or friend is sick/injured and the characters desperately need to find antibiotics or insulin or the like.

I understand that this is a bit silly going from fiction but those stories are appealing because they get you to think about how you would deal with life-threatening challenges. In a way it's odd that we have all of these important and effective medicines but whether the emergency services and doctors are blown to smithereens, bitten by zombies, or just overwhelmed with patients after an epic earthquake/flood/eruption there's really no way to access them without looting or black market.

I just know that in the event that "shit hit the fan" to use the prepper terminology, I'd prefer to be the guy with a case of antibiotics and painkillers stashed in the basement than the guy hoping I can get treatment at a hospital or local medic.