Innate Kaze Flip (440ml/15-Ounce, Aqua Blue) - 2012 Double wall vacuum construction made with premium type 304, 18/8 stainless steel; Keeps liquids warm or cool up to eight hours: pretreat with hot or cold water for best results Clever push-button thermal stopper gives "one touch" conversion to allow drinking while stopper is screwed in place Proprietary modular handle fits V2 collar: May be used as a travel mug when sipping collar and stopper are screwed firmly in place, but converts to a slim cylinder for packing Unique screw-on modular sipping collar has tapered mouth area to keep fluids "on track" Lined drinking-cup lid allows use as a conventional vacuum flask