The Lunchbots Thermal 8 ounce holds 1 cup of liquid, perfect for soup on-the-go. The 3.5 inch diameter is ideal for kid's hands. Made of the highest-quality stainless steel, your lunch will arrive at its destination safe and sound. All 18/8 food-grade stainless steel interior, no plastic touches your food. Dishwasher safe for easy clean up, seal removes easily for thorough cleaning, do not microwave. This container is completely leakproof and triple insulated for superior heat retention, keeps liquids hot for 6 hours. Dimensions are 4.25 inches tall x 3.5 inches wide, 8 fluid ounce capacity. Great for both kids and adults!