Less Weight. More Miles. Durable, yet 20% lighter than our other 40 oz bottles, this lightweight stainless steel insulated water bottle is made for hiking and backpacking. The wide opening lets you add ice, and the large 40 oz volume holds hours of hydration. Lightweight hydration to keep you going 20 percent lighter than our other 40 oz Wide Mouth bottles TempShield double-wall vacuum insulation keeps drinks cold up to 24 hours, hot up to 12 Made with 18/8 pro-grade stainless steel for durability, pure taste and no flavor transfer Flexible perforated strap and aluminum pivots to minimize weight Leakproof when closed Bottle fits most backcountry water filters BPA-Free.