The Pro QD is the first BC that incorporates i3 technology. For years, the Pro QD has been an extremely popular BC for novices and experts alike. Now, with the addition of i3 technology and fresh, new cosmetics, its popularity is sure to soar.Integrated i3 (patent pending) technology for safer and easier control of inflation and deflation One upper and one lower Flat E-Valve keeps the BC streamlined while offering effective and responsive air dumping One-way valves prevent water from back flushing into the BC, greatly reducing captured water The oral inflator is easy to deploy and use. It can easily be removed to provide a access port should you ever need to rinse the inside of your BC SURELOCK™ mechanical weight release system (patented) offers unsurpassed ease of loading, ditching and security of weight pouches Two lobe-retaining D-rings that can be held to steady the lobe for easy weight pouch insertion Two 10lb weight pockets on sizes XS – ML. Two 16lb weight pockets on sizes L - XXL Two, side-release non-ditch pockets (except size extra small) increase overall weight carrying capacity as well as provide proper trim in the water A new, integrated Octo-pocket (patent pending), is a convenient way to secure your octopus regulator.A three-dimensional expanding gusset around the backpack (patented) provides increased lift capacity Outer bladder constructed of Armorshield™ Cordura® for increase wear and fade resistance Sculpted shoulders using the exlcusive Sea Quest swivel buckle system (patented) provides unsurpassed fit and comfort Traction pad (patented) built into the proprietary contour back pack prevents cylinder slippage Over-molded carrying handle makes carrying the BC a breeze. Standard on all sizes Upper, right-hand, shoulder pull dump as an alternative dumping method Six stainless steel D-rings to attach all of your accessories Two large zipper utility pockets with pull cord are easy to open / close Knife grommets on left lobe accommodate any one of the fine Deep See knives Depth compensating waistband with 11/2 inch buckle and lobe strap COLORS: Black/Red, Black/Silver Size: xs, s, m, ml, l, xl, xxl.