What sizes are available?
I have been working intensively with planners for over a year. Simply because I love them and can’t get enough of them. 😇 Among other things, I have been able to gain some experience with the Filofax models. Apart from the fact that I can see at a glance what size planner it is, I can recognize (almost) every Filofax model. Would be something for „Wetten, dass…?“ 🤣
Here is a nice overview of the Filofax planners (https://eu.filofax.com/pages/organiser-sizes)
As far as the ring mechanisms are concerned, you can assume that Personal inserts fit into all Personal planners. Whether Filofax, Moterm, Gillio or whatever they are called. This is about the rings and NOT the size of the planner (leather) on the outside. Because every manufacturer has its own models, which differ slightly in terms of dimensions. The ring sizes are then important. I have seen this mistake a few times when someone started to state the external dimensions of the leather when selling a planner on a platform and then came up with A5 instead of Personal.
Risk of confusion
A6 and Personal are also often confused. This is because the inexpensive models in the various online shops are often stated as A6 and are actually Personal. Very annoying if you actually want to order A6, because this size is also available. Not from Filofax, but from other retailers.
This would be the ring mechanism of a Personal planner:

Here is the ring mechanism of an A6 planner for comparison:

I hope I was able to give you a little overview of the sizes of the Filofax planners. My favorite models are Malden, Lockwood, Holborn and Croc. 😋
Bye, Tina 🫶🏼