GSI Boulder Flask

It’s lightweight. It’s rugged. And, it’s hip. The Boulder Flask is not your typical beverage flask. Rather, it is the type of beverage container you don’t mind bringing anywhere especially in the great outdoors. Regardless of how high it will fall, you can be sure that its reinforced bumper edges will keep the integrity of the flask and the richness of your drink. The silicone cap is hinged so there’s no worry of ever misplacing it. It has a large capacity, too, at 10 ounces. Made of copolyester, the Boulder Flask is the perfect companion for weekend backpackers and even daytime mountain trekkers.