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GSI Outdoors says:
The GSI Outdoors Microlite insulated vacuum bottleline are perfect bottles to keep your tea steaming hot, your water ice cold and your soup that perfect, piping hot temperature. The incibly lightweight, thin-walled, MicroLite 720 Twist vacuum-insulated bottle provides 12 heat and 24 hours of cold retention while being 1/3rd lighter than traditional designs.
We're working out what we think about GSI Outdoors' Microlite 720 Twist Vacuum Bottle, we'll add our comments here in due course.