Let's see, the pre-felted blob is 20" wide at the top and 7" wide at the bottom when laying flat. It is 12" tall. The dimensions after felting are supposed to be 8 1/2" high, 11" wide, and 4" deep. I am using leftovers of Lamb's Pride Bulky. The directions call for worsted weight, doubled, at least for the bottom of the purse. There is a discussion on another group on whether the pattern says to double the worsted weight throughout the bag or just for the bottom. I assumed doubled thoughout and substituted bulky.
If you decide to knit this purse, definitely check out the errata page on Cast On's website. The purse is an unusual design, but the pattern is a bit tricky to follow.