System Includes:

Aluminum cylinder w/CGA-870 toggle valve
Regulator with contents gauge, (0 to 15 LPM)
2 Standard masks and 2 cannulas
Padded cylinder bag
Duration chart, instructions
.
Specs:
Cylinder - 4 cu.ft./113 liters - 2216 PSI
8.4" x 3.21 diam. 1.6 lbs

Duration (10K ft.) @ 1.5 LPM = 75 minutes for one, 37 minutes for two. 
Oxymizers increase duration time to 150 minutes for one, 74 minutes for two.