Ty Williams Hydro Flask 32 Oz Double Wall Vacuum Insulated Stainless Steel NEW eBay Consuming 300 mg of caffeine per day, equivalent to 2 3 cups of coffee or tea, is generally considered safe for most adults. Caffeine, a natural stimulant, can enhance alertness and concentration. 12 oz. Coffee Mug We're dropping a limited restock of the Micro Hydro with @dickssportinggoods, and everyone has the same chance to score. Just download their app and enter the draw by May 12 at 9 Amazon.com: HYTYSKAR 24 OZ Extra Large Ceramic Coffee Mug, Jumbo Coffee Mugs, Big Tea Cups with a Large Handle for Office and Home, Microwave and Dishwasher Safe (24 OZ Star Blue) : Double Walled Glass Coffee Mugs 2 Insulated Cups 12oz