From Diana:I am going to do the french market bag, but have picked up a havier yarn than specified in the pattern- main colour is 14ply (I think) cherry red pure wool from Martas, and the contrast is a 12 ply yellow/orange/grey green pure wool also from Martas.
I've knit up a tension swatch (which I was planning to throw in with the washing tomorrow night to felt it) using 5mm needles- Addi turbos also from Martas, which has produced a fairly dense fabric that is slightly larger than the required tension- which I think should be fine.