Hi.There are three types of them.
1) Free standing base water filled. Had it long time ago (century). Good to punch, good to kick, you can even simulate some throws. What is bad, the bag slides away. After 5 punches you could move about 3-5 feet. Did not have any problems with workmanship.
2) Hanging water core bag. Has a plastic water bottle inside. Got one now. Century Hydra Very good. Less traumatic than regular bag. But if you goal is sheen conditioning, good only at the beginning.
3) Hanging water bag. Contains a rubber bladder inside. Worked on one before very good, does not have that mach of a swing.
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