Non-obvious, inexpensive items everyone should have

A reddit crowd-sourced list of NON-obvious  items that everyone should have.  Here are a few that I found a little unusual. Visit reddit for the explanations 😀

    • Jumper cables
    • Lint roller
    • Ear Plugs
    • High quality socks
    • Headlamp
    • Paracord and knot knowledge
    • Cast iron skillet
    • Emergency sewing kit
    • Knife sharpener
    • Baby Wipes
    • Hammock
    • Birth control
    • Library card
    • Water filter
    • Thank You Cards
    • Musical instrument

Via Reddit, what are some non-obvious inexpensive things that you think everyone should have? : AskReddit

Get in! No time to explain!