Yes IDCrewDawg, if someone is claustrophobe, this is dangerous! The hood Chattel69 proposes might be better to keep controll by the dom as a bag without air and no way to get air provokes immediate breathing trouble.
A friend of mine keeps her breath that much under controll that she rather loses consciousness than to struggle for air. I tend to fight back, being tied at the arms and neck I break down everything around me. The sign for my partner to interfer...