I bought this notebook to use as a vacation planner, but also as a keepsake journal of my trip. The product dimensions are reported accurately on the site - 3x5. Not very big, but that's part of what's so great about it. The book is high quality, and I love the little pocket on the inside back cover to hold ticket stubs, etc. (I had trouble confirming there really was a pocket before I bought it, so I wanted to specifically mention that it DOES!) I also love how the book is laid out with plenty of space for my own notes and thoughts - a true journal.
Now for the cons: The tear out sheets are about the size of a quarter - I can't imagine actually using those, but - hey! It could happen. Also, the maps aren't detailed enough (in my opinion) to really navigate a foreign city. They're great for planning, but not all of the small side streets are marked, so I suspect I'll need to get another map when I arrive. Finally, my book came wrapped in the manufacturer's plastic, but was missing the stickers for customizing the tabbed sections. This was not a big enough deal to me to warrant returning the item, because the pre-labeled sections were sufficient for me.
Even with the cons, though, I must admit that this is one of the coolest PRE-souveniers that I've purchased.