Food-grade materials - This water bottle is made of stainless steel and BPA-free silicone, which is heat-resistant, non-toxic, and safe for boiling water, making it ideal for daily use or outdoor adventures. Foldable design for space-saving - This 1.5-liter portable water bottle features a foldable silicone body that can be easily collapsed for storage, saving space in backpacks, suitcases, or camping gear. Versatile outdoor use - Whether you're camping, picnicking, traveling, or barbecuing, this foldable water bottle can prepare hot drinks or boil water anytime, anywhere. Secure strap for easy storage - The included secure strap ensures the water bottle remains folded during transport, preventing it from unfolding in your bag and keeping your gear organized. Practical handle and lid - Equipped with a sturdy handle for easy and safe pouring, and a sealing lid to minimize spills and speed up boiling - this water bottle is designed with functionality and safety in mind.