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.