Help Using regular garbage bag with nitrogen method?

[TehArgentum]

Hey all. I have been experiencing problems with finding big plastic bags recommended in PPeH (PVC 35cm x 50cm bags and polyester turkey oven bags, to be exact). I had bought a few big size oven bags but they all leak air and aren't made of polyester, and it seems like they do not sell bags designed specifically for turkey over here. So it basically leaves me no other choice but to consider using polyethylene garbage bags and I was wondering if it would be safe to use one? I remember someone from this forum suggested not to use it, but while doing my research on the method I found 2 case reports and in both cases people who killed themselves using this method had garbage bags on their heads. Links:
https://www.researchgate.net/publication/266392993_Full_article
http://www.rjlm.ro/system/revista/31/153-156.pdf

 

[TehArgentum]

This is what I've made the other day following the 'Doing it with Chi' video as a guide. I tested it by filling it with air and pressing it with a hand, it didn't seem like any air was leaking to me. Then I pulled it over my head (after getting rid of most of air first) and I couldn't stand being in there after 4 minutes and 27 seconds, it was very warm, I felt shortage of breath and headache afterwards.
Buuut being an overthinker and pessimist I'm really scared that it might still somehow leak air or other problem might occur, like me tearing it off during convultions :( So what would you say, guys?

 

[Deivis]

One inside of another would do. Or three.

 

[TehArgentum]

One inside of another would do. Or three.

Yeah I thought of it too and tried to make it with 2 bags but when it comes to the part when you need to fold up the bottoms and tape 'em together, there's air that stays between the bags that I can't manage to get rid of. Even if I crumple those bags up first to make sure all of the air is gone, some air gets in when I fold up the bottoms. Any thoughts on this?

 

[Deivis]

Have a bath tub filled with water. Put the bag on your hand, like a glove. Stick it into the water.
See now what I'm saying?