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Get it between 2025-02-27 to 2025-03-06. Additional 3 business days for provincial shipping.
NO METAL: Tough and shatter-resistant, the Boulder Flask can stand up to nearly any outdoor adventure; Thermoplastic resin body keeps your drink of choice intact
Wide mouth opening makes for easy filling, pouring and drinking; Molded graduation marks help you quickly measure or see what’s left while you’re on the trail
See-through design for a fun and novel drinking experience; Hinged top with grippy silicone bumper makes for easier opening, helps prevent leaks and ensures you won’t lose the cap
Weighing only 4 ounces empty, the Boulder Flask won’t weigh you down even after you fill it
This BPA-free flask is durable, safe to drink from, and doesn’t have any foul or “off” aftertaste
Celebrate your outdoor adventures with the GSI Outdoors Boulder Flask! Its copolyester resin construction is crafted to withstand any bumps, drops and dings along the way. The wide mouth design makes it easy for both filling up or pouring directly into a cup–plus an attached hinged silicone cap ensures a good grip even in cold temperatures. This BPA-free flask also features graduation marks molded on its surface, so you can easily check how much beverage remains inside without having to guess. Whatever your “poison,” you’ll enjoy worry-free trail sippin’ without any foul taste from the flask material. Don’t leave camp without this handy companion by your side!