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James DIY’s his own Aqua Punch Bag out of secondhand marine parts for £10.
The buoy used in this clip is a Polyform A4 20” rubber buoy. The hoseline adapter came from an airbed.
According the Aqua Bag manufacturers, the more water you add, the harder the bag is, less water = softer bag.
If the bag reaches your desired hardness, but is still saggy or wrinkled, you can inflate with air to tension the rubber bag.