The world's first cold brew coffee maker for people with sensitive stomachs. The Hourglass Cold Brew Coffee Maker System uses no electricity and eliminates coffee waste; reducing environmental impact on our planet, supporting sustainability and saving you money. This is the world's first cold brew coffee maker created especially for people with sensitive stomachs and health conscious coffee drinkers. The high heat and fast brew times of hot brew coffee create bitter coffee that's high in acid and hard on the stomach. The portable Beam Kanteen keeps the coffee extract fresh in the fridge for up to two weeks. The patented Hourglass coffee maker solves this problem, with cold brewing. Because delicate coffee beans are not exposed to heat, bitter acids and oils are never released. The result is a pure coffee extract with 69.6% less acid than hot brew that's easy on the stomach and never bitter.