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Inflatable Punching Bags for Adults! Answered

I've always wondered how one could make an inflatable punching bag.  I realise I could go to a current manufacturer and get them to make one custom for me, but its just printed plastic with a blow hole, right?  Any ideas - on types of plastic and such?



below is an example of what I'm refering to:


. They may be made of one of the vinyl polymers (eg, PVC). Probably welded using heat and pressure. The "blow hole" looks/feels more like Tygon to me.
. But those are just guesses.