Stanley tumbler ice ring hack identified

A specialized ice ring maker designed to fit the conical shape of Stanley tumblers has been identified as an effective way to keep beverages cold all day. The system uses three different sized ring-shaped ice pieces—small, medium, and large—that stack within the cup.

These ring-shaped ice blocks feature a hole in the center, which allows a straw to reach the bottom of the drink despite the large ice volume. The ice rings are produced using a numbered silicone mold to ensure they are stacked in the correct order.