The Ice Test Nobody Talks About
Everyone claims 24-hour ice retention. We tested it. Here are the real numbers.
Test Method
40oz tumbler filled with standard ice cubes, sealed lid, no opening for 24 hours. Ambient temp: 22°C indoor, then 32°C outdoor for the final 4 hours.
Results
- 24h indoor (22°C): 30% ice remaining. Water was cool but not cold.
- 28h total (32°C outdoor): 15% ice remaining. Still drinkable cold.
- Control (regular cup): 0% ice after 4 hours.
Key Features That Matter
Double-wall vacuum: No condensation on the outside. Dry grip even after hours.
Handle design: Ergonomic, doesn’t interfere with lid seal. One-handed operation.
Straw lid: Fits standard 17mm straws. Seals tight — we tested it upside down, zero leaks.
Size Matters
40oz is the sweet spot for daily use. 30oz is too small for all-day hydration. 64oz is too heavy when full. 40oz = 1.2 liters = perfect for office or car.
Buy It
shop.hkras.com carries the 40oz version with handle and straw lid.