It's designed for single tank use. The air cell is extremely streamlined and its frontal width (as the diver assumes swimming position) is barely wider than an average person's shoulders.

A compact, doughnut-style air cell for use with a single, backmount tank, offering 30 lbf buoyancy in a streamlined design that’s only slightly wider than the average diver’s own shoulders. Low-pressure BC hose is included.

• Circular, donut style air cell with 30lbf buoyancy
• For use with single, back-mounted tank
• Outer shell constructed of 1680D PU coated ballistic nylon
• Inner air cell constructed of 210D TPU coated nylon
• Low pressure BC hose is included

FEATURES

• Low pressure BC hose included.
  
• Style: Circular doughnut
• Buoyancy capacity: 30lbf (13.6kgf)
• Bladder material: 420D TPU coated nylon
• Shell material: 1680D TPU coated nylon
• Inflator length: 16'' (40.6cm)(tech elbow)
• No. of automatic pressure relieve valve / pull dump: 1 (at left waist side)
• Mounting grommets distance (C-C): 3 sets in total, 11”(27.9cm)
• For single back mount tank only (100cuft / 15L internal volume)