This KMASHI 20000mAh external battery is bright blue. That alone should be enough to distinguish it from the couple dozen other external battery packs you've picked up over the years. When the local power grid fails for an entire month, you will be the one guy in town whose smartphone is actually better charged now than it was before everything went dark.
Then once the mail person drops it at your door, you can charge it up, stick it in your drawer, and wait out the next local disaster. Everyone made fun of you before. They said your obsession was unhealthy. But the power's been out for a week now, and you've been gaming the entire time. Who's laughing now?