I'm talking about while still on the dive. If you're in Mexico doing a long dive in 30 ft of water, pullin out a snickers or sandwich while your still in route might be a little cumbersome. Sure at a deco, there's a lot you can do. But I'm talking about something to give you the umph to not decide to turn the dive on a very long swim. At deco, the dive's over. You're just payin the interest on making the dive then. You gotta sit there whether you want to or not. But during the dive, it would be nice to be able to refuel.