Alex Lindsay's pick of the week on MacBreak Weekly 407 is the Seagate Backup Plus Portable Thunderbolt Adapter. This uses a SATA connection, so it can be used to make any drive, including SSDs, into an external drive over Thunderbolt. This is great if you're working with large video files in the field, and need the speed of Thunderbolt for backing up an transferring files. If you fill up a drive, you can just swap it out for another SSD. And since you're just using standard SSDs, it's easy to find them at a store if you need to buy more.
There are some downsides to this adapter depending on how you use it, however. Since the SATA connections on these SSDs weren't made to be swapped frequently, there's a limit to how many times you could plug a drive in and take it out. It's also sized more for a spinning hard drive, so you may need to use something to pad it more so it fits an SSD better -- Alex used hotel keys. But if you want to make fast, usable external drives out of regular SSDs, the Seagate Backup Plus Portable Thunderbolt Adapter is a convenient way to do it.
To hear Alex Lindsay's explanation of this thunderbolt adapter from Seagate, check out MacBreak Weekly episode 407.