Very easy to fill and vacuum insulated - the Wide thermos flask by Klean Kanteen! Made from double-walled stainless steel this premium product is robust and ideal for travelling. It keeps your beverages hot for up to 6 hours - or cool and refreshing, depending on what you fill in. The bottles are flavor-neutral and come with a leak-proof Café Cap 2.0. So when you are on your way, you can easily take a sip and safely close the lit again. The design has a large opening and you can use the bottle in combination with a number of outdoor water filters. Perfect for outdoor activities!