Insulated beverage container

A method of using a handheld beverage container for cooling a beverage, the method comprising:

• cooling a thermal reserve of a handheld beverage container, the handheld beverage container comprising:
• a container body elongate along an axis to have a top end and a bottom end, the container body configured to stand on the bottom end, the container body comprising:
• an outer tubular sidewall coaxial with the axis;
• an inner tubular sidewall located radially inside the outer tubular sidewall;
• an outer bottom wall connected to the outer tubular sidewall;
• an inner bottom wall connected to the inner tubular sidewall so that together they define a hold that is configured for holding the beverage;
• an opening on the top end of the container body through which the beverage can be introduced into, and removed from, the hold;
• and
• an insulation chamber located radially between the inner tubular sidewall and the outer tubular sidewall and axially between the inner bottom wall and the outer bottom wall;
• and
• the thermal reserve located between the hold and the insulation chamber, the thermal reserve fixed in position relative to the outer tubular sidewall;
• introducing the beverage into the hold of the handheld beverage container;
• and
• cooling the beverage within the hold by heat transferring from the beverage to the thermal reserve while the insulation chamber insulates the thermal reserve.