Store › Classic Sourdough Loaf Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 Classic Sourdough Loaf $12.00 Classic Sourdough Loaf, 70% Hydration Ingredients: Flour, Water, Salt. Preorder Added! Classic Sourdough Loaf, 70% Hydration Ingredients: Flour, Water, Salt.