Here's another from my collection of knitting bags.
It's a heavy-ish cardboard suitase that I got in Avoca Handweavers last December. It's about a foot wide. (Sorry, none left, they sold out very quickly.!)
I didn't exactly NEED it, but could I resist that printed stocking stitches in those Andy Warhol-y colours? You bet I couldn't.
And it holds quite a lot too.
Here's the Louisa Harding Grace & Wool
It's great for holding sharp pointy things (like dpns) that otherwise might poke through a fabric bag and stab you in the leg when you're trying to feed children and knit at the same time. It happens.