Defining omni journaling is tricky because this is a very specific phrase describing a number of very common journaling techniques.
To be more specific, omni journaling is all about combining a variety of journaling techniques.
For example, adding washi tape for a little decoration inside your planner… that’s omni journaling.
Travelers notebooks are great for omni journaling, especially if you like to keep “functional” and “creative” seperate or with minimal cross over.