Method Would a diving mask and a exit bag be a better one?

[pen]

Connecting the mask's exhaust to a hose that goes trough the bag, exiting in the neck.

Connecting the intake from the N cylinder to the exit bag or the mask intake?

 

[Thanatonaut]

Do you have a problem with CTB with a clear plastic bag on your head? That's understandable and while your idea is good in theory, it's overcomplicating things, and if there's one time you don't want a Rube Goldberg machine, it's when you're CTB. If you really want to CTB rapidly and painlessly, putting up with having a bag on your head for 10-30 seconds before unconsciousness is a minor inconvenience.