BX-24 : One-Place Basic Aviation Oxygen System with Oxymizer 

High pressure ,refillable aluminum cylinder 
680 liters/24 cu. ft. - 4.38" x 24.9" - weighs 7.4 lbs.
CGA-540 Low profile valve with gauge and shut off
Adjustable flow regulator, 12 position, 0 to 8 LPM all brass interior
1 Oxymizer conserving cannula
Cylinder duration at 10,000 ft: 30 hours w/Oxymizer, regulator set @ .25 lpm