It's kinda funny that you can buy a 256 GB SSD for less than the price of this sticker-pocket, usb cable combo. My Macbook has a 256 GB internal SSD that can barely handle installing both the OS and XCode at the same time!
It's pretty secure. You can honestly save money be going with the stock USB c cable and duct tape, but I prefer the aesthetics of the pocket and short cable
Although duct tape sounds pretty amazing now that you mention it. If somebody walked into a hacker meetup with a drive duct taped to their laptop I'd assume they were pretty awesome.