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windaddict said..
All depends on which GoPro you are talking about? Go Pro Hero 5 and newer are water proof to 10 meters without a case, so no need for the extra weight!
I have a 7 Black and have never had any issues using it as is.
It depends on how they rate 10 m.
A 10 m watch is only good for in rain or in the shower . If swimming with a watch the stroke force when hitting the water can be much higher . In watch terms you want 50 m or more just for swimming.
A GoPro at the tip of a mast during a high speed catapult would create way more than 10 m depth waterproofness.