Hydration Capacity: 16 oz (.5 L). CamelBak® Got Your Bak™ Guarantee: If we built it, we'll Bak it™ with our lifetime guarantee. Double-Wall vacuum insulation keeps water cool for hours. Flip, Bite and Sip. No tipping required (though possible: just remove the straw). Durable and spill-proof. Easy to carry: Integrated loop handle makes it easy to clip a carabiner or carry with the crook of a finger. Naturally 100% BPA-Free, taste-free stainless steel. No inner liners or plastic coatings that aluminum bottles require. Wide-mouth opening is easy to fill with ice and water and a breeze to clean. New CamelBak® Big Bite™ Valve is compatible with CamelBak® eddy™ and CamelBak® Groove® bottles.