CorBag: Coordination Punching Bag
This punching bag moves unpredictably like a real opponent.  Unlike traditional bags which move rhythmically CorBag's movement is random.    It has a 4.8 star rating on Amazon.  It has MMA Strike Zones: head, body, leg.   Best punching bag for footwork and coordination.   You don't hit it as hard as you can; think,  sparing or shadow boxing targets.

Ringside Large Leather Heavy Bag
You can choose between 100, 130, or 150lb bag.  Double stitched leather means this is a professional gym quality heavy bag.  4.9 stars on Amazon.  A chain and swivel are also included.  This bag is for intermediate to advanced users - designed to take a rigorous pounding for years to come.

Century Wavemaster
This bag is a classic, the original freestanding punching bag.  Great for people or places where you can't hang a traditional punching bag.  4.6 stars on Amazon.  The striking target can be adjusted from 47"-68" tall.  It can be filled with water or sand.  Free Shipping.