FRC Team 2875 aka Cold Spring Harbor's Cyberhawks present their 2015 bot: Pandora
https://www.youtube.com/watch?v=NAjm5ToxKUo
Using a bottom pivoting arm set with feeder wheels, Pandora grabs cans and chutes totes to load them up onto the second loading platform arm that keeps the stack stable for release and keeps the continual stack pressure off the winched arms. Grab, drop and repeat.
Hope you like it!