NALGENE TRITAN TUMBLER
Its a cup, a shaker, a mixer, a measurer, an opportunity to share. The only thing it won't do is break. The super sturdy Nalgene Tritan tumbler can dress up a casual picnic table just as easily as it can cool down a serious hiker. Separating the inner and outer cup the first time requires a couple of squeezes to break the seal. After that it's easy. BPA-free!