Inflatable Punching Bags for Adults!

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:

Picture of Inflatable Punching Bags for Adults!
NachoMahma7 years ago
. 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.