Maximum volume. Its strong points are buoyancy force, sturdiness, and comfort. The accuracy in the detail, like the dual-retainer strap on the adjustable and removable shoulder strap, the adjustable D-rings, the removable jock strap, the dual back-up pocket, the rear weight pockets anchored directly onto the tank strap, and the use of highly resistant and non-abrasive fabrics make this a high-end professional product.