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GearJunkie tested 20 thermoses over 3 years in various outdoor activities. Temperature retention tested at 30 minutes to 24 hours with 200°F water. Tests conducted in Pacific Northwest and Eastern seaboard
Stanley Classic Legendary offers 40 hours hot and 35 hours cold retention. Contigo Autoseal West Loop provides 7 hours hot and 18 hours cold retention. Thermos Stainless King features DrinkLock Technology for leak prevention. Stanley Classic Easy-Pour Growler keeps coffee warm for 18 hours
Stanley Classic Legendary Bottle 2.5 QT offers best insulation and lifetime warranty. Stanley Adventure To-Go Bottle 1.1 QT provides budget-friendly alternative. Zojirushi Stainless Bottle SJ-JS10 excels for commuters with 1.1 quart capacity
Thermoses tested for heat retention at 150°C for 3, 12, and 24 hours. Larger thermoses showed better heat retention. Products evaluated based on durability, features, and cleaning ease
Sir James Dewar invented first vacuum flask in 1892. German glassblowers Burger and Aschenbrenner developed protective stainless steel cover. Company name "THERMOS" derived from Greek word for heat