Reminds me of the "hippo roller" http://en.m.wikipedia.org/wiki/Hippo_water_roller http://en.m.wikipedia.org/wiki/Hippo_water_roller That was invented in 1997,

Reminds me of the "hippo roller" http://en.m.wikipedia.org/wiki/Hippo_water_roller http://en.m.wikipedia.org/wiki/Hippo_water_roller That was invented in 1997, basically the same thing, but appears larger, plus with the simpler design is probably cheaper. Edit to add: it's actually one of the reasons I am majoring in mechanical engineering, completly restarting from the ground up is fine, but seeing a weak link and improving it is often far more cost effective. I can just imagine someone seeing a barrel fall on its side and roll down a hill and their eyes lighting up.