Something like the Sew together bag or the Bionic gear bag would work I think. I have the pattern for the Bionic Gear bag and I plan to make it up soon. What I like about them is that they zip closed for transport, and have separate areas to isolate different notions or supplies.
http://www.patternpile.com/sewing-pa...-together-bag/
http://www.patternpile.com/sewing-pa...-tote-pattern/