I ordered 2 Klean Kanteen Wide Mouth Insulated Loop Cap 20-Ounce for my wife and myself on mar 25, 2013 and received them on mar 28, 2013. we've owned the original bottles for many years. they are durable and we feel good about that we are doing something for the planet. Klean Kanteen Wide Mouth Insulated Loop Cap are even better. they keep cold drink for long time (description says hot for 6 hours and cold for 24 hours). i even did a small test myself. I used brita filtered tap water and put 6 ice cube in the bottle and i left it for a couple of hours. then i went for a long walk with it. constantly having sips through out the walking. when i got home, ice cube were melted little bit. i added more filtered tap water which melted ice cube to a half size and i left it for a couple of hours. i checked if the ice cube were still there and there it was. cool. it lasted over 10 hours. of course, it depends on how cool the water is but it works great. i would have given 5 stars but there was little particle inside the insulation making noise everytime i shake one of the bottles. for that reason i gave 4 stars.