The Optimum Nutrition Gainer Shaker is a high-capacity, 1-litre shaker, designed for Serious Mass users who need a durable, leak-proof solution for mixing large, high-calorie shakes with ease. It features a stainless steel wire mixing ball for smooth, lump-free shakes and a leak-proof, screw-top lid for mess-free transport. Made from high-quality, BPA & DEHP free materials, it's perfect for post-workout shakes or on-the-go nutrition. With its sleek Jet Black design and Optimum Nutrition branding, this shaker is the ultimate tool for mixing large, high-calorie shakes without the mess or hassle. It also includes a secure, easy-to-use flip-top cap.