Camelbak continues to innovate their line of "flip and slip" hydration products. The new Stainless Steel Better Bottles are made from medical grade stainless steel which offers a taste-free, stain resistant liner and provides a durable exterior. The Better Bottle design is unique because you don't have to un-screw the lid of the bottle to get a drink. Just flip up the Big Bite Valve and take a sip. These bottles are spill proof, so you can toss them in your backpack or gym bag with no worries.