that i can make on my own
Bean bags are not filled with foam. They are filled with polystyrene beads (small white foam pellets) here in the UK you can buy them in department stores.
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This question has been asked here before:https://www.instructables.com/answers/Sewing_up_a_bean_bag_sofabedFiller_ideas/
As always, it depends where you are in the world. In the USA, "Joannes" probably carries stock, in the UK, where I live, I'd buy them at the local market. Steve