Nalgene Tumbler is 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 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.

Capacity: 240ml