Can I give this 6 or 7 out of 5 stars? The ramblers are perfect. I actually prefer the 20 ounce just because it fits well in my hand. But it keeps drinks cold or hot forever. Two other things that get overlooked are: (1) the exterior temperature never changes (so it is never hot or cold too touch despite keeping your drink the right temperature, and (2) it floats! I was fishing on a river the other day and it slipped out of my sling holster. I started to freak out, but it stayed there, while I fought the fish. Not only that but the magslider kept it water type.

Durable, great insulation, worth every penny. I wouldn't choose anything else it has become my everyday cup of choice.