Ideal for freediving and spearfishing, this anatomical modular backpack delivers a comfortable fit. It features special handy weight compartments with water drainage openings, adjustable padded shoulder straps with quick-release buckles for greater security and easy release in an emergency, and a flexible line for fastening to the belt for added stability. Offers option to change the buoyancy with standard 1lb. (500g.) or 2.2lb. (1kg.) weights, up to a maximum of 8.8lb. (4kg).