The TriBalance from Lastolite is the same shape and size as their popular TriGrip. It has one black/white/grey side which allows you to custom white balance for calibrated colours and select the best exposure for all tones pre-capture, or to adjust for shadows, highlights or mid-tones as required post capture - just like the XpoBalance.
The reverse side of the TriBalance is a Lastolite silver reflector for filling in those shadows with just a flick of the wrist.
It collapses to a third of original size, can be held in one hand and is perfect for location or studio work.