I know, I know, there are lots of lovely slouchy hobo bucket bags around.
And here is mine!
It’s the one I make again and again.
The bag part is about 30cm x 30cm flat plus handle/strap, but will stretch out to nearly 40cm!

Pattern has 2 handle lengths.
And also has a bonus pocket you can sew in.

What you need:
4mm hook
Hand bag: 75g Stylecraft Special DK
Cross body bag: 85g Stylecraft Special DK