Method Using these for Exit Bag?

[NAB]

Hello!

I have been thinking about how to do my exit bag. Instead of trying to figure out some seemingly complicated design (resources such as videos also looks like they've been taken down, making it even harder) and I was thinking simply to use a drawstring 20l bin bag like this:



The yellow big is a plastic string that can be used to tighten the bag. There is a small gap where the two sides come together to be tied, which could be ideal for putting/taping the tube. The bag could also be adjusted with a sweatband on top or an elastic placed inside next to the plastic string?
I dont want to mess this up, so I'm very curious of your opinions. Could this work?

 

[Wunderkind]

I tested garbage bags, 20 liters seemed a little small to me

 

[GasMonkey]

I saw 1 paper documenting the case of N₂ CTB using a garbage bag, on woman that had cancer.
I don't have that paper anymore, but there are more cases of people who have used trash bags.

 

[NAB]

Thanks!
20l seems perfect when testing it, but they also come in 40l.