Hydration Capacity: 24 oz (.7 L). CamelBak® Got Your Bak™ Guarantee: If we built it, we'll Bak it™ with our lifetime guarantee. Redesigned cap and bite valve provide faster flow and enhanced durability. Flip, Bite and Sip. No tipping required (though possible: just remove the straw). New, sleek shape fits in the hand and most cup holders. Naturally 100% BPA-Free, taste-free stainless steel. No inner liners or plastic coatings that aluminum bottles require. Durable and spill-proof.