Thanks for all the suggestions guys. I've got some other ones I'd like to include, but since I'm in the start-up mode (i.e., cash strapped and on a shoestring budget) it'll be a while before I can get to them all.
Also, thanks to all that are buying them. Be sure to pick one airtube and stay with it (constant switching will wear out the airtube hole).
Rbertalotto, I actually did a test by painting a 1 liter bottle black on one side, and the temperature got up to 110F (a bit warm for my taste, and above what we recommend).
A good way to check the temperature is to pick up the bottle - if it's too hot to hold comfortably, it's far too hot to use. If you can hold it comfortably, splash a little on the inside of your wrist (just like checking a baby bottle).
Also, thanks to all that are buying them. Be sure to pick one airtube and stay with it (constant switching will wear out the airtube hole).
Rbertalotto, I actually did a test by painting a 1 liter bottle black on one side, and the temperature got up to 110F (a bit warm for my taste, and above what we recommend).
A good way to check the temperature is to pick up the bottle - if it's too hot to hold comfortably, it's far too hot to use. If you can hold it comfortably, splash a little on the inside of your wrist (just like checking a baby bottle).