Earplugs are a great addition to any bug out bag. What you may not realize is they can also help you when you are fishing. You can use earplugs as bobbers when you fish. This is a cheap way to craft a bobber when you are in a survival situation.
Just thread the hook through the foam earplug. Then, the earplug will go down into the water if you hook a fish.
With this in mind, add a few earplugs to your bug out bag. You ca use them to protect your ears and for fishing. Anytime you have an item that has more than one use, it is a good idea to stock up. After all, you never know when you might run out of something and need to use something else to accomplish your goal.