Here are some of the dimensions of the new GoPro HERO9 Black in case you're trying to see whether it will fit in an existing accessory.
GoPro Hero9 Black Review
GoPro Hero 9 Black Review: Time to Upgrade
MORE EVERYTHING. More power. More clarity. More stability. New Live View Front Display. 30% More Battery Life. Detachable Lens. Waterproof 33ft. MORE
GoPro HERO9 Black - Waterproof Action Camera with Front LCD and Touch Rear Screens, 5K HD Video, 20MP Photos, 1080p Live Streaming, Stabilization +
BUNDLE: GoPro HERO9 Black + PNY Elite-X 64GB microSDHC Card Adapter-UHS + 1 Smart Remote 5K VIDEO: Shoot stunning video with up to 5K resolution,
GoPro HERO9 Black + Smart Remote + PNY Elite-X 64GB microSDHC Card Adapter-UHS - Waterproof Action Camera with Front LCD and Touch Rear Screens, 5K
GoPro Hero9 Black Review
GoPro Hero9 Black vs Hero8 Black Comparison: What is new and is it worth upgrading?
GoPro Hero 9 Black review
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GoPro HERO9 Black Bundle