This Hydro Flask Lightweight Wide Mouth water bottle is made of stainless steel and is designed for lightweight durability on hikes. Its TempShield vacuum insulation keeps drinks cold for up to 24 hours or hot for up to 12 hours and eliminates condensation. Made from durable 18/8 pro-grade stainless steel with a brushed-steel finish it is easy to hold fits most backcountry hydration filters and is leakproof. The bottle includes a lightweight cap with a flexible perforated strap and aluminum pivots. It is BPA-free Phthalate-free and compatible with various cap and lid types.