I have got over half-way with the bag, but it seems much bigger than I thought Lucy's was...
... and a bit floppy - but I'll line it, so that'll be OK.
I made the base as per instructions, but added a picot dc (UK terminology) row at the end of the increasing bit, to give definition to the bottom. (Heaven knows I need definition to my bottom!).
So far I am very pleased with it, but next time (all those leftovers from the granny blanket) I'll do a rectangular base, I think.