A standard 20 oz stainless steel tumbler is a versatile, mid-sized vessel designed for both hot and cold beverages.1 It is widely considered the "gold standard" size because it provides enough capacity for a large coffee or tea while remaining portable and easy to hold.2
Key Specifications
Dimensions: Usually about 6.5 to 8 inches tall with a 3-inch diameter at the top.
Base Design: Most are tapered at the bottom to ensure they fit into standard car cup holders.3
Material: Constructed from 18/8 food-grade stainless steel, which is rust-resistant and BPA-free.4
Insulation: Features double-wall vacuum insulation.5 This creates a thermal barrier that:
Keeps drinks cold for 12–24 hours.6
Keeps drinks hot for 6–12 hours.
Prevents "sweating" (condensation) on the exterior.7
Common Features
| Feature | Description |
| Lid Type | Usually a clear, splash-resistant press-in lid or a sliding closure. Many are straw-compatible. |
| Finish | Often finished with a powder coating for a slip-resistant grip and added durability against scratches. |
| Cleaning | Most modern versions are dishwasher safe, though hand-washing is often recommended to preserve the vacuum seal long-term. |
| Taste | The high-quality steel ensures no flavor transfer, so your water won't taste like the coffee you had earlier. |
20 oz Winnie the Pooh and Friends Spring Tumbler – Blue Sky Floral Stainless Ste
Most high-quality 20 oz tumblers keep drinks cold for 12–24 hours and hot for 6–12 hours, thanks to double-wall vacuum insulation.
