It is incredible. It's fantastic. It's a knit brain bag!
I will be keeping my eyes open for doctor's-bag-type-purses at second-hand shops. And for brain-coloured yarn. I'm not looking forward to basically knitting either a big grey stockingnette tube or a big grey stockingnette strip and then seaming the sucker afterwards, but I think it would be well worth it. It is totally and honestly my favourite purse. . . that I have ever seen.
P.S. Its the Brain-bag from Undercover by Jun Takahashi