16 oz by Volume. 

Shampoo Ingredients: Purified Water, Sodium Laureth Sulfate, Lauryl Glucoside, Cocamidopropyl Betaine, Sodium Chloride, Propylene Glycol, Diazolidinyl Urea, Methylparaben, Propylparaben, Citric Acid, Disodium EDTA, Aloe Barbadensis Leaf Juice, Argania Spinosa (Argan) Nut Oil, Cocos Nucifera (Coconut) Oil, Persea Gratissima (Avocado) Oil, Fragrance Oil,