Why? Well there are plenty of needle cases for sale but there didn't seem to be one that fitted the picture I had in mind and I did spend quite some time searching for something that I liked and did the job. Lots of needle cases are designed for standard needles (which seems rather short-sighted particularly as knitting on circs is becoming very popular) and consisted of a roll of material. Would you believe that some weren't even padded - can't see what protection that would give to your needles, unless of course they are the metal variety.
I particularly wanted something that would hold all my tips, the cables, the little cable ends and the diddy thingy that you use to tighten the tips and cable together (which is grandly called a tightening key) and the needle gauge which is really important and the early tips don't have the size on them, so you need to check before use or face the consequences
I came up with two potential formats - one that folded sideways like a book and the other more like a clutch bag. I quickly disgarded the book type as despite a flap the tips kept falling out
I am thinking of going into production - would make a really nice christmas present for an avid knitter perhaps?