Altruism 500ml Thermoses Cup Double Wall Stainless Steel Thermoses Mug Drinkware Travel Thermoses Coffee Cup Thermoes Vacuum Fask Cups Vacuum insulation technology for maximum temperature retention; Keeps hot for 20 hours, or cold for 24 hours Truly Leak-proof: Will not leak! The only mug with a vertical lid lock. Ensures no accidental spills and allows for convenient 1-hand operation Safe & Nontoxic: BPA-free lid and food-grade stainless steel mean there are no chemicals that can leech into contents. Drink with peace of mind Durable and sanitary 18/8 stainless steel interior,Wide mouth accommodates full size ice cubes,Compact design takes up minimal space while maximizing capacity Lid is made with BPA-free copolyester to resist stains and provide durability Baking finish handling cup Bottle is anti-fingerprints and oil resistance. Smooth flow design helps control the flow of warm liquids