Here's an efficient way to fine-tune your at-depth trim position. These trim weight pockets can be mounted on any 2" webbing or tank band/cam-strap. They enable you to distribute your ballast weight for optimum balance and in-water stability. They can also prevent the aluminium tank from floating and the valve hitting your head towards the end of the dive when your tank gets empty.
Sold in pairs, each pocket comes with secure squeeze buckle closures and can accommodate 2.2lbs/1kg of ballast weight. Please be aware that trim weight pockets do NOT have a quick dump mechanism. Make sure to be able to establish enough positive buoyancy in an emergency even with your trim weights in place.
Useful links: SCUBAPRO X-TEK line manual