I bought some bamboo bag handles from Twist Fibre Craft Studio and set to work knitting a monster cabled knitting bag. Here it is...
Yarn: Cygnet Seriously Chunky
Pattern: improvised... CO60st, 4 rounds reverse stockinette, increase to 100st, then p4k6 rib with a cable every 7th row. I decreased back down to 60st for the garter st border at the top, and made buttonholes on the front side. I knitted big blobs and sewed them to the inner back for buttons. Crochet cast off incorporating the handles so I didn't have to sew them to the bag afterwards.
Hurrah for quick knits!