I just got the bigger Misty Mate, it's about the size of a large water bottle, and has a opening big enough to put ICE and water in. I figure since I'm the pack mule of the family, instead of having to carry everyone's small misty mate... why not just have 1 large one that will need refilling a lot less often... it comes in a nice carrying sleeve with a pocket and a strap to wear like a fanny pack.