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Thermos "Under Armor Dominate Stainless Steel Vacuum Insulated" flip top.

Has kept ice while sitting in the kitchen for 12+ hours.

It's able to keep ice (with several fresh water top offs through the day) all day long on the course. (36 holes anyway)

The flip top lid is awesome and it has a small latch that you can elect to use to stop accidental openings - like in the cooler pouch of your golf bag.

http://www.thermos.com/products/dominate-stainless-steel-vacuum-insulated-hydration-bottle.aspx