This might be what you are looking for
Here's a videos
This site has info and the process takes about 10 minutes:
Here's a post that might help you - https://lifehacker.com/organize-and-dispense-plastic-bags-with-a-2-liter-bottl-508358311
This one is a cup dispenser, but I think it would work for bags, too.
This one is super simple. https://www.hometalk.com/34720553/easy-plastic-bag-dispenser
Hi Ann, here's a lovely video that will show you how - https://www.youtube.com/watch?v=KNH2U2HFBVc
You cut a Plus Sign in the Bottom or the Side. It works just like the Lids from Wet Ones. If you need to, cut off the Sharp Edges to make them round.
Just in case you want another alternative, I created this one for myself - https://chascrazycreations.com/trash-bag-storage-dispenser-container/
Here is an idea from Pinterest https://www.pinterest.com/pin/211880357456232108/