I haven't got a clue about where to start with this! I'm building a freestanding heavy bag. Since I live in an apartment I can't hang my bag, so I've decided to build a base to slip my bag onto. I have the materials but not the knowledge. Can someone please help me figure out what the base needs to weigh to keep the bag from toppling over? Thank you!!!! The bag is cylindrical; height is 6' and diameter is 16". It can be filled up to 150lbs. The base is cylindrical as well; height is 10-11" and diameter is 30". I'll be adding a 3/4" thick base underneath the base to help with balancing. I'm thinking a diameter of 45" should be enough. I will also create a secondary base and stand that will be placed inside of the base for the purpose of slipping the bag onto. The average generated force of my kick is about 650lbs.