Make it a tall. Our large sized Roaster™ Loop vacuum flask is the choice for long days. TempLock™ double wall vacuum insulation keeps hot drinks hot for up to 10 hours, iced-coffee frozen for 40 hours, and IPA's cold for 16 hours. Our patented Roaster™ Loop Cap is insulated and designed for sipping, drinking or chugging and is available with an attachment loop (or without).