This vintage pattern is made available by Free Vintage Crochet.
I love this style, with the flap and handle in one. The bag looks durable, and you can use any applique or initials to embellish it.
The pattern calls for J. & P. Coats Knit-Cro-Sheen, a No. 4 or 5 steel crochet hook, a stick of wood and snap fasteners.