I saw these Peter Pauper traveler’s notebooks at a local bookshop. They are really nice because they come all set up with three notebooks (lined, dot-grid and blank in super paper) a Kraft folder and a really nice plastic folder (zipper one one side, two pockets on the other).
I found them on local sites all over the world – anywhere that sells Peter Pauper I guess – and also on eBay and Amazon. So if you want to try one, they will be easy enough to find. I did not actually measure them but the inserts look to be ‘Midori’ regular size.
I have had Peter Pauper journals in the past and they are very nice quality. I actually prefer them to Paperblanks.