I tried out the Ninja Thirsti because it's made for holding my fizzy drinks such as my soda pop and seltzer water.  We went up to the river yesterday and I filled mine up with some cold RC cola and a ton of ice.  All day long as I sipped, I enjoyed my soda, just as fizzy as the first sip!  And my ice didn't melt and make my soda all watery.  I still had solid ice in my Thirsti when we got home several hours later!  I love I can drink from the spout or use my personal metal straw there.  I think Ninja has done the travel bottle up just right.  I do drop things, and no matter how often I dropped this, the seal remained tight and there were no leaks!  I was super pleased that there was a handle that was never in the way when I was drinking from the spout.  Also, no ridges on the handle for dirt and grime to get stuck.