Canson 702-2448 Xl Watercolor Pads - 18 X 24 In.

I love this brand of paper because it's a nice sturdy 140# weight. You can cut it into 4 x 6" postcard sizes and not worry about it bending or not holding up in the mail system. I use it especially for my watercolor pencils which use quite a lot of water, and the paper doesn't buckle up like some lighter weight papers do. It also works terrifically with pen and ink drawings because the surface isn't too textured. All in all, its a great, all-purpose heavyweight paper that will work with almost any medium! And the price, compared to other brands, is extremely reasonable!!

Great size, price and quality.