Your diet isnt in order its no wonder you dont gain weight, it will be pointless in using any gear you need to learn how to eat to gain weight, thats your problem.
Go to the diet section and read the stickies about weight gain/bulking diet and re-design your diet, you have to compelely change your eating habits for the rest of your life if you want to be heavier, foregt gear for the time being and sort your diet out.