When using a Luxfer aluminum 80 four of the pounds you carry are for the tank. The remainder is for you and your suit etc. In saltwater in my 3mm shorts and top I use four pounds on the tank and two pounds on a belt, if I carry my camera I may dispense with the two pounds on the belt. The four pounds are carried in weight pockets on my camband straps unless I dive without a BC in which case it all goes on my belt so that I can dump it in an emergency on the surface and need to get buoyant. So, anyways, I am carrying four to six pounds total in saltwater with a 3mm long sleeve top, beenie and 3mm shorts. You will have to determine your own weight needs but the fact is most people dive over weighted and comparing person to person is often of not much value. N