GearGripper

From the website:

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GearGripper arrives in the shape of a well formed wave.  

Just push your phone into it and feel the soft yet firm grip. 

Soft tactile foam with a formable core allows total customization. 

You can form it to suit your needs — leave it as is or create your own perfect shape. 

Besides being great for your everyday gear — a perfect place to empty your pockets — it has endless applications.

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$9 (gear not included).