The A5 Boston has 20 mm rings, and most of Filofax's A5 binders have 30 mm rings so this one is significantly slimmer. It's also not as wide as some of the A5 binders. I could definitely carry this one in my bag with me everywhere! And, I can switch out the A5 pages with my Mother Ship A5 Finsbury that stays on my desk.
So here is the A5 Boston compared to my A5 Finsbury. Here you can see how much wider the Finsbury is:
Not a great photo, but you can kind of see how much bigger the Finsbury is (bottom) with its 30 mm rings as opposed to the Boston's 20 mm rings:
Below you can really see the size difference, Finsbury on top and Boston on bottom:
I tried to get a shot comparing the rings on the Finsbury (top) and Boston (bottom):
Anyway, you get the idea: the Boston A5 is significantly slimmer, narrower and less bulky than a Finsbury A5.
The Boston is made from soft Nappa leather.
Here's a view of the inside cover. There is a full-length pocket, and several card pockets. The top pockets are smaller than the bottom ones so larger cards can fit in the bottom pockets.
At the back of the binder is a notepad. I took it out to see how much slimmer and lighter the binder would be without it.
With its classic design, the Boston looks great. And its super-smooth leather feels great in your hands (which is very important to those of us who are tactile like I am).
Many huge enormous thanks to Filofax USA for sending me this binder as a sample to review. This is the A5 Filofax I've been searching for!!