Abstract: A protective cover for SCUBA air tanks includes a tube of plastic material for snugly fitting around a body of a tank. The tube includes a substantially non-stretchable portion of plastic material having two side edges, and a resiliently stretchable portion of plastic material disposed between the two side edges, for allowing the tube to snugly fit tanks of various sizes. Attachment pads may be disposed on the non-stretchable portion for attaching auxiliary diving equipment. Various rings, clips, buckles or other fasteners are disposed on the tube for attaching auxiliary straps or carrying belts.