I bought this product because I was tired of getting my bag wet from condensation with my Camelbak water bottle, which left rings and puddles on my work desk. Plus, I was annoyed with having to time my visit to the cafeteria everyday before it closed to refresh my ice. I had tried every method to have cold water throughout the day, including freezing large amounts of water the night before in the Camelbak to get a slow melt the next day. The last straw was when I was intending to buy a neoprene sleeve for the Camelbak in the hopes of not getting my paperwork wet...and then my (now genius) husband suggested I look at the Thermos line.
This one is leakproof, does not leave rings and puddles, and does not sweat all over my bag - goodbye, sloppy, wet mess! The top can be screwed off to make filling with ice easier. I fill the Thermos to the top with ice and water at night, with confidence the ice will still be there 24 hours later. I even had to pour hot water into the Thermos tonight to melt the ice so it would fall out so I could clean it.
This Thermos is a bit bulky and heavier than what I'm used to (not ideal for carrying on a hike), but its size means I don't have to fill it up with water that often when it sits on my office desk. Of the five Thermos products I own, I find that this one is the hardest to clean with a bottle brush, as it is the tallest, and it does not fit on the top shelf of my dishwasher.
Yet, I give it five stars because it provides great insulation, and I have appreciated its capacity during long car rides to ensure an ample supply of cold water. Thermos products are the best!