dear sirs, I am really disappointed when I found out that the " panda outdoor vacuum clean flask 500 ml" costs 4,5 euros, I bought it for my local market and I did the test, I put cold water in both chilly's and panda bottles , left them in the same room and checked the temperature of the water in certain periods of time (2h,5h,12h and 24h),it was the same temperature. The weight is almost the same, I don't really care about the design(ok chilly's bottles are nice),so give me a reason to buy a chilly's bottle again??and if your answer is "quality" and longer life I remind you that chilly's is 6 times more expensive .....