Why not use an old CD case for circular knitting needles storage! No more cables tangled together -- Just neatly stored in individual sleeves that are labeled with a sticker as to the size of the circular needle within.
Free Knitting pattern for DPN Needle Roll - Catherine Ward's simple clever design holds double pointed needles in place with strategically placed rows of purl stitches. Be sure to check out the projects for customization ideas. Other knitters have added f