Color me skeptical, however my initial thoughts are that this rollerpack is best suited for well established and cleared trails only.

Sorry but that one video link of the man going over "rocky terrain" with the rollerpack is a bit misleading....I can foresee issues going across larger boulders and boulder fields etc. All it would take for that wheel to slide off a bigger rock sideways too much and causing a person to loose their balance enough to have him/her suddenly do a head or face plant...

I can also see problems where any trail that has mud sections that dragging this loaded through the mud will only cause that little skinny wheel to sink in like an anchor. What about climbing over/under downed trees on a trail?

Also it would be a hindrance, especially this time of year when many trails that start at lower elevation only to encounter snow at the higher elevations then drop down a bit where there is no snow again. Continuous switching from rollerpack mode to full backpack mode would get old fast under this condition or any of the above conditions I mentioned above.

Another poster mentioned the 90 day warranty. Why such a short time for a product that appears to be fairly well constructed? Most people would only get out for a few days of actual hiking within that 90 days and certainly not every time with the rollerpack.