Alex Ikonn and UJ Ramdas together created an essentially blank booklet with pre-formatted pages to be used as a daily journal. The 5 minute journal was born when UJ and Alex were walking in a park talking about their morning and evening routines. Basically UJ wrote a journal in a short format every night before going to sleep. Both of them recognized the chance to develop this idea into a tangible (physical) product and sell it online. They even developed and IOS app.
The journal is a 268 page hardcover book available at fiveminutejournal.com .
Once the journal got recommended by Tim Ferriss it apparently sold out on amazon.com.