SPACE-SAVING COLLAPSIBLE CUP DESIGN: Say goodbye to bulky shakers that occupy unnecessary space. Embrace the ultimate space-efficient solution with our shaker bottles for protein mixes. Compact, lightweight, and versatile, our collapsible water bottles' innovative design folds down effortlessly, ensuring hassle-free storage and portability wherever you go. SMOOTH NONSTICK MATERIAL: Our protein shake mixer goes beyond the basics. Featuring a built-in mixing ball, our protein mixer ensures smooth, lump-free shakes with every use. In addition, our protein shaker cup uses a non-stick silicone interior, ensuring your whey powder won't stick to the bottom.