leirbagsillih wrote a review of Black Diamond Neutrino Rackpack - 6 Pack on May 3, 2012
Even if you are not pairing these with the C4's these are amazing! I use them on my tri-cams and they make sorting through them soooo easy. Although they do match the C4's perfectly where as you have to kind of generalize colors to rack your tri-cams.
Bottom line (literally) BUY THEM!