The absolutely essential hydration tool for any and all nuclear watch-standers (or lesser nuclear-associated beings). 20oz or 30oz volume, stainless steel construction, and an insulating double-wall design to keep the hot things hot and cold things cold.

Includes a re-useable straw, aggressive glow-in-the-dark coating, and your eternal satisfaction. The 30oz option includes an upgraded watertight lid to make your tumbler spill-proof.