I couldn't find a super chunky yarn in the right colour so I used two strands of Hayfield Bonus Chunky. It only took 400gms. I have knitted a second one for our house, but I'm not finished just yet as you need to sew a liner to keep the stuffing inside...and sewing is soooo long winded when it's done by hand.
Other : A cotton liner. The measurements are in the pattern.
I also knitted a small circle in the same wool and stitched it into the centre to fully close the top as there was too much bulk to pull it tightly enough to completely hide the liner otherwise.