you can put alot of plastic bags one in eachother untill you get a nice strong bag, make your hole at the bottom for your plant. also use some duct tape to support the hole and bags. i havent tryed this my self but i'v had the idea for a while.
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cut a hole out of the bottom of a pail preferably 5 gallon and hang on a nail or post and then put apiece of plastic around the roots as you put it in and then spread it out
hope this helps you. good luck with your planter. https://www.instructables.com/id/Go_Green_Upside_Down_Hanging_Planters/
There's several Do it yourself guides on this very site!