Small albums for drawing - a real salvation for those artists who draw always, everywhere and in any situation. If they didn't exist, they'd be worth inventing! It is very difficult to always carry a large sheet of paper and a bunch of pencils or paints. But it is enough to take on the road your album or just sit down with it in the corner, so that no one interfere and quietly draw whatever you want. If you have paint, then paint, but even if you have a couple of liners or pencils at hand, it's great!
I have the albums of A5 format, but in the sale there are albums and smaller. This, of course, is not quite an academic approach to art, but for training drawing or as an image of large objects is quite suitable.