I tried to verify the heat insulation capacity of the ultra-high performance heat insulation bottle 'mountain exclusive bottle' that cools only about 6 ° C in 7 hours and see if it
Thermos Ultimate Insulation Bottle for Mountain 900ml FFX-901 Matte Red | eBay
Thermos Ultimate Insulation Bottle for Mountain 900ml FFX-901 Matte Red | eBay