Boulder 10 Flask

Thermoplastic resin body

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

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

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.

Lightweight

Weighing only 4 ounces empty, the Boulder Flask won’t weigh you down even after you fill it.

BPA-free

This BPA-free flask is durable, safe to drink from, and doesn’t have any foul or “off” aftertaste.