The sports bottle is made of food-grade eco-friendly silicone, 100% non-toxic. Foldable water bottles perfect combination of fun and practicality, these clever little expandable and collapsible bottles shrink down when empty to fit inside a small bag, ready to be filled up again and reused. lightweight water bottle is collapsible you can save half of the space in the bag after using it. Multipurpose water bottle for running, use while traveling, sports, gym, running, and more.