GSI Outdoors Boulder Flask

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An instant classic. This no-nonsense, good sized flask is lightweight, durable and easy to use. No matter what you intend to fill in with, water, milk or something stronger and more interesting this is a great flask for taking with you. 

GSI Outdoors says:

Your favorite beverage can now go anywhere in the Boulder Flask. Includes graduations for measuring and can take any fall with the sleek bumper flask. The Boulder 10 Flask holds 10 fl oz, has a shatter-resistant body with bumper, graduations, and a hinged silicone cap making it impossible to misplace.

Our Verdict

GSI Outdoors’ 2020 Boulder Flask holds up to 295ml of your favourite tipple. A simple, clean design with see-through sides (so you can see how much you have left) and a silicon grip around the sides to add stability and durability. The same rubber is used on the screw top to add extra grip making it easy to use. The use of shatter resistant plastic mean this is a pretty rugged flask and has been a firm favourite for overnight camping trips for a while now.

This updated version has the benefit of using BPA Free plastic. The lightweight design of this flask it topped off by the intelligent use and placement of the silicon bumper. You know it’s a good item when there is a queue here at UOG for staff to get one!

– Reviewed by Ultralight Outdoor Gear

Features

• Shatter-resistant, copolyester resin body and grippy, silicone bumper mean this flask can go anywhere
• Wide mouth makes for easy filling, pouring and drinking
• Hinged top with silicone grip is easy to open and impossible to misplace
• Convenient molded graduation marks
• BPA Free

Specifications

• Weight: 116g
• Capacity: 296ml / 10 fl oz
• Dimensions: 3.7 in x 1.1 in x 6.5 in
• Materials: Copolyester, Silicone
• Includes: Hinged cap, Silicone Bumper, 10 fl. oz. Flask