For TWS earbuds that store the buds' stems vertically like with the Apple AirPods, the charging cases have a small and deep tunnel where dirt and bacteria can get in and fester. It's not impossible to clean but it does take some effort...
The Double Barrel Bluetooth Earbuds concept offers that convenience by turning the charging case into two hollow tubes with openings on both ends. The inspiration for this design was, apparently, a double-barrel shotgun...
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