True Nutrition makes taking your supplements that much easier with the GoStak® Supplement Stacker by Blender Bottle®, a convenient and easy-to-use storage container that can fit up to four different materials in its separate sealable compartments. The four stackers can be hand-tightened to create an air-tight seal using BlenderBottle®'s trademarked Twist n' Lock™ technology. Don't waste any more time with those bulky containers and powdery messes at the gym; grab a Supplement Stacker to make pre-, intra-, and post-workout supplementation that much easier today! BPA and phthalate-free.