SanDisk Extreme Portable SSD V2
What you're looking at in the picture above is not an iPhone case. It's a portable-yet-high-capacity solid state external drive with 1050MB/s read speeds and 1000MB/s write speeds, wrapped in a rugged silicone shell with a carabiner loop so you can securite it to a backpack, lanyard, etc.
Since it's meant to be carried into the field or anywhere else your adventures take you, they designed the drive to be as durable as possible, with two-meter drop protection and IP55 water and dust resistance. In other words, you'll be able to capture photos and video footage in just about any environment without having to worry if your data is safe.
The drive comes in 500 GB ($85), 1TB ($160), 2TB ($320), and 4TB ($700) storage sizes. They also have a PRO version that allows for even higher sustained speeds (2000MB/s read and write).