Algodoo

This is a contraption that is designed to bear weight at the top. The legs have springs connected to the body, creating a suspension. It can hold more than 15kg and bounces good. The second version with the ice foot is meant to move, hold the W key down for a bit until the rear leg is fully compressed, and than let go. The absolute max it can hold is 55kg before collapsing. It weighs 7.3kg itself (version 1.)