This is how Thermos Funtainer and Foogo stainless steel water bottle works. Foogo available from: http://www.ashnjuls.com.au/Stainless-Steel-Water-Bottle-with-Straw-BPA-Free-p/thermosfoogobottle.htmFuntainer available from: http://www.ashnjuls.com.au/Stainless-Steel-Water-Bottle-with-Straw-BPA-Free-p/thermosfuntainerbottle.htmFoogo and Funtainer are made exactly the same way. The price difference is due to packaging. Thermos Foogo has more packaging than Funtainer.My Facebook: http://www.facebook.com/pages/Ash-N-Juls-eco-everyday-basics/128073070573116?sk=infoMy Twitter: https://twitter.com/#!/AshNJulsMy Blog: http://ashnjuls.blogspot.com.au/