Also, you can’t store music on the AirPods, nor store it on Apple Watch, nor connect the AirPods to the previous iPod Nano.
AirPods as the New iPod
Sean Everett

Yes, you can store playlists to the Apple Watch and control that play via Siri on the AirPods when they are connected to the Watch.

Update after seeing another’s response:

You don’t need the latest (Series 2) to store music on the Apple Watch. All versions do so thru Apple Music by syncing the playlist to the Watch.

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