AINAAN Collapsible Water Bottle, Silicone Folding Kettle,Portable-for Outdoor/Camping/Hiking/Office-400 mL | 13.5 Oz, 2019, GrayWith its unique collapsible design you can expand and compress the bottle as often as you need, without compromising its rigidity, so it can easily fit into your travel bag or backpack directly depending on the amount of water you have. Exceptional design, 100% approved our Collapsible Water Bottle for outdoors is made of 100% food grade silicone (BPA free) FDA approved and certified for non toxic. It can withstand high temperatures 0( 40 to 446F),