From the book:

"The next time you go on a picnic -- or the invitation says BYO -- carry your wine along in this elegant bag.  The soft, thick felt will keep the bottle well protected, and even contribute some insulation.  The grape "vine" and grape leaf "veins" are applied using a technique known as needle felting.  The "grapes" are made by felting fleece (see page 157 for directions)."