The vertical friction foam technology is unique and the boxes are waterproof, a welcome feature after having dunked most every other fly box I've owned! It specs at 160 flies...we'll see! I'm impressed with the construction, see thru lids and a nice tight latch.
For smaller stuff the Crystal Creek series sports a magnetic side and the same friction foam as above with a watertight gasket.
So far....so good. Maybe this IS the year for finally making sense of what patterns to carry... in what... and when! Two twins and a mag box do fit nicely in one compartment of the FP Guidepack below.