Amazon.com : FitStill 60M Waterproof Case for Go Pro Hero 11 Black/Hero 10 Black/Hero 9 Black, Protective Underwater Dive Housing Shell with Bracket Accessories for Go Pro Hero11 Hero10 Hero9 Action Camera :
GoPro Protective Housing for HERO9/HERO10/HERO11 Black ADDIV-001
Recsea GoPro Hero9, Hero 10, Hero 11 Black Underwater Housing