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VACUUM TUMBLER
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A vacuum flask is a container designed to keep liquids hot or cold for extended periods. It consists of two layers, with a vacuum between them that acts as an insulator, preventing heat transfer.
A vacuum flask is a container designed to keep liquids hot or cold for extended periods. It consists of two layers, with a vacuum between them that acts as an insulator, preventing heat transfer.
| Feature | Details |
| Material (Exterior) | – Stainless steel (most common: 304 food-grade) |
| – Occasionally plastic or powder-coated steel | |
| Material (Interior) | – Stainless steel (for durability and taste-neutral use) |
| – Some older flasks may use glass liner | |
| Insulation | Double-wall vacuum insulation – airless space between walls minimizes heat transfer |
| Capacity | 350 ml (12 oz), 500 ml (17 oz), 750 ml, 1L, 1.5L, 2L — varies by use case (personal, group, travel) |
| Temperature Retention | – Hot drinks: 6–24 hours |
| – Cold drinks: 12–36 hours (depending on brand & quality) | |
| Lid Type | – Screw cap or push-button pour spout |
| – Lid often doubles as a cup | |
| Leak-Proof Design | Yes – tightly sealed; ideal for bags/travel |
| Mouth Opening | – Narrow mouth (better for heat retention) |
| – Wide mouth (easier cleaning & ice cubes) | |
| Dimensions | Varies — typically tall and cylindrical, fits in backpacks/bottle pockets |
| Weight | Light to moderate: ~300g–900g depending on size and material |
| Handle/Grip | – Some include carrying handles or straps |
| – Textured/powder coating for grip | |
| Durability | High – built to withstand daily use and impact (especially steel models) |
| Use Case | Hot coffee/tea, soup, iced drinks, baby formula, camping, commuting |
| Cleaning | Most are hand-wash recommended; wide mouth makes it easier |
| Safety | BPA-free plastics; food-safe materials |
| 5 star | 0% | |
| 4 star | 0% | |
| 3 star | 0% | |
| 2 star | 0% | |
| 1 star | 0% |
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