2 issues I have with exit bag

[proxy123]

Hello. I'm considering using helium bag method, however I have two issues with it.

1. If I take empty bag, push all air out of it and then pull it on my head, tightening on the neck, there always is some air remaining. Enough to breathe. How is this method supposed to work, if there always is some air?

2. If helium keeps pumping into the bag once I pass out, won't the bag blow up eventually? Leaving me possible braindamaged, since I was out of oxygen for few minutes, but probably not long enough to die?

 

[Superfluous]

1. If I take empty bag, push all air out of it and then pull it on my head, tightening on the neck, there always is some air remaining. Enough to breathe. How is this method supposed to work, if there always is some air?

I believe the idea is to fill the bag with helium after you push all the air out and before you place it over your head. As long as the bag remains with the opening at the bottom, then the helium should stay inside (as it's lighter than air).

2. If helium keeps pumping into the bag once I pass out, won't the bag blow up eventually? Leaving me possible braindamaged, since I was out of oxygen for few minutes, but probably not long enough to die?

The bag should have "a neckband of elastic that allows the bag to make a snug, but not tight, fit". This is to allow excess gas to escape from the bottom of the bag as the pressure increases.

If you haven't done so already, please read PPeH and Five Last Acts, both available for download in the [Resources] List of resources thread. PPeH May-2018 seems to be the latest version, and each chapter is available for separate download.

 

[Walilamdzi]

Helium is often diluted, so nitrogen has been the recommended gas for quite a few years.

 

[proxy123]

I live in Poland and already asked retailers, they all say it's 99-100% helium.