BOSS Growler w/Infuser TriMax® Insulated Stainless Steel Water Bottle. The BOSS keeps drinks cold up to 150 hours and hot up to 24 hours. The dual-opening lid is easy to grip, has a wide mouth for easy filling, and a small mouth for smooth pouring. The large capacity 64 oz BOSS was named “Best Insulated Growler” by Craft Beer and Brewing Magazine. Custom laser engraving available for the perfect holiday gift.