it's a common worry of people who don't fully understand what AirPods are, they only see the two little earbuds and assume those are carried loose when not being used. They come with a little dental floss looking case that the AirPods magnetically snap into, and charge when you're not using them, and the case is roughly the size of a rolled up set of headphones. While wearing them they sit pretty snug, and you realize most of the time when headphones fall off is because the wire gets snagged one something, so no wire = nothing to pull them out unexpectedly.
I've had them since January and the only times I've "lost" them are when I forget to take them out when I fall asleep, and in the morning I play a loud song and they can easily be found in my bed and returned safe to the case.
I never really understood the hype of Bluetooth headphones until I got these, since Bluetooth speaker pairing can sometimes be a pain in the ass, but I can't imagine going back now. You pop em out of the case and they have 100% battery since the case has been charging them. No need to fiddle with a tiny annoying on/off switch and then pairing because there is no switch and the pairing is automatic and instant. Put them in your ears and they recognize it's in your ear and starts playing. Take one out of your ear to automatically pause if you need to hear something. Put them back in the case when your done and they snap right in and charging starts back up. They couldn't be more simple and hassle free