We're working out what we think - we'll add our view here!
GSI Outdoors says:
With its sleek design and clean construction, this high-spec, durable Glacier Stainless Vacuum Bottle will keep your beverages hot or cold for hours and hours. Perfect for commuting, picnic, sporting events and base camping.
We're working out what we think about GSI Outdoors' Microlite 500 Twist Vacuum Bottle, we'll add our comments here in due course.