The Glorious O2 and D2 Pro are wireless gaming mice that are considered "superlightweight ... them in line with other lightweight gaming mice like the Logitech G Pro Superlight, Razer Viper ...
Meta is working on a lighter mixed reality headset codenamed Puffin. The Puffin headset is planned to be as light as 110 grams, includes an external puck for processing, and lacks controllers.