Roof-mounted occupant restraint system

A restraint system of a vehicle having a roof and a cabin with a seat for an occupant, the restraint system comprising:

• an inflator mounted to the roof of the vehicle;
• an airbag communicatively coupled to the inflator and inflatable to a deployed position from a stored position, the airbag comprising:
• a main body, comprising:
• a first side facing the roof,
• a second side facing away from the roof,
• a first end coupled to the first and second sides,
• a second end coupled to the first and second sides, and
• a tether disposed within the main body and coupling the first side to the second side;
• a first tube having a first distal end communicatively coupled to the inflator and a first proximal end coupled to the main body between the first end and the second end, the first tube having a first one-way flow valve disposed within the first tube between the first distal end and the first proximal end and arranged upstream from the main body;
• and
• a second tube having a second distal end communicatively coupled to the inflator and a second proximal end coupled to the main body between the first end and the second end, the second tube having a second one-way flow valve disposed within the second tube between the second distal end and the second proximal end and arranged upstream from the main body, the tether being arranged laterally between the first tube and the second tube.