My version of the Altoids mini watercolor box, 1" x 2"
It has two sawn-off brushes, a wiping rag, two cologne sample bottles for water, three half pans of ultramarine, alizarin, and hansa yellow. I don't need much water because I dip and wipe the brush between colors instead of swishing it around and muddying the reservoir.
The folded book is 8x11" folded in sixteenths and cut three times on opposite edges.