For years I carried a Rhodia sketch book everywhere I went. Although they were so good to me (I have stacks and stacks of them in my archives!) I now carry my beloved Moleskin. I love the simple black leather cover with the elastic strap and the weight of the paper is perfect! It is such a classic design.
Take a peak at some of my favorite notebooks in the market.
#1 Moleskin #2 Rhodia #3 Russel and Hazel #4 Kate Spade #5 Smythson of Bond Street #6 Exercise Book #7 Rewrite