There is a lot of hype in the outdoor world about double walled, insulated coolers and water bottles. For years I have been acquiring a collection of Kleen Kanteen products. Everything from their bottles to their insulated food containers have made their way into the rotation. My wife and I were even hiking through a remote part of Hawaii and we found a used Insulated Wide Mouth that had presumably fallen out of one of the tourist helicopters. It is still used daily. Recently they had one of their gigantic 64 oz Insulated Classic bottles available and I snagged one. A few months later the temperatures in Phoenix hit those summertime highs and the bottle was put to the test.
The Short Story- After first purchasing the Kleen Kanteen Insulated Classic 64 oz, I wasn't sure what I was going to use it for. I knew I was going to store water in it, but beyond that there was a direct need. Fast forward a few months and it has found a place as my daily vessel for keeping water cool in hot places. I have recently been using it to store ice water for after work runs in the summer time heat. The night before I fill the Classic a quarter full of ice and place it uncapped in the freezer. In the morning I pull it out and it fill it with chilled water from the fridge; cap it; and toss it in the trunk of my car. From the early morning until mid-afternoon the bottle cooks in the trunk (car is parked in full sun), until I pop it open to top off my reservoir. The water and ice is still in tact. With an ambient outdoor temperature of 115 degrees, you can believe that my car's trunk is significantly hotter. The local news love to run goofy experiments to demonstrate how hot it gets in the car and I would safely guess my trunk is above 180 degrees on the hottest days. Even through the extreme heat the ice is still clanking around when I grab the bottle. Although sometimes the exterior of the bottle is too hot to touch!
Another use for the Classic 64 oz was to store water in the car after multi-day backpacking trips. I fill the bottle with ice and water and leave it in the parked vehicle so that we have ice cold water at the trailhead. Because of the efficiency of the bottle, it takes up significantly less room then having a cooler. I use mine for water only , because I found the narrow neck difficult to clean other liquids out of. I do use a bottle brush, but sometimes you can't get everything. If you planned on using it for other liquids I would suggest going for a wide mouth version.
Conclusions- I have never had any complaints for the Kleen Kanteen line of products. The 64 oz Insulated Classic is no different. If you are looking for a tough, reliable way to keep your liquid cool or hot then this bottle will work perfect. Don't let the initial investment sway you away from the convenience of having ice cold water everywhere you go. The fact that the bottle works so well in the back of my car (on 115 degree ambient exterior temperature days), is reason enough to suggest the bottle. Kleen Kanteen makes a wide range of insulated and non insulated products to suit whatever your needs are. Check out their full lineup here.
*This product was purchased for testing.