The Google Cardboard is awesome, allowing you to DIY a VR headset using nothing but recycled cardboard and your Android smartphone.

Holding it in your hand while enjoying stereoscopic content, however, definitely isn’t convenient. Hands-Free Headgear is a wearable adapter that lets you safely and comfortably secure Google Cardboard to your face.
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https://www.coolthings.com/hands-free-headgear-google-cardboard/