Gear & Equipment — Camp Kitchen & Picnic — Bottles & Thermoses

GSI Outdoors Boulder 10oz Flask - Orange

GSI Outdoors Boulder 10oz Flask - Graphite

New

Available colors

Detailed view

write a review

40 Reviews

(33) (6) (1) (0) (0)

Show all reviews

WRITE A REVIEW

* Indicates a required field

* Score:

* Title:

* Review:

Was this product true to size?

size

It runs small True to size It runs big

Review's title & body can't be empty Question's body can't be empty Please enter a star rating for this review Name field cannot be empty Invalid email Your review has already been submitted. Max length was exceeded Please fill out all of the mandatory (*) fields One or more of your answers does not meet the required criteria

Thank you for posting a review!

We value your input. Share your review so everyone else can enjoy it too.

Thank you for posting a review!

Your review was sent successfully and is now waiting for our staff to publish it.

Reviews (40)

Updating Results

Nathan C.

22/01/23

Perfect Flask

After spending some time looking at Snow Peak and other overpriced Titanium flasks, I decided to get this (much) cheaper GSI flask. It's practical for it's purpose. It will get used on the odd hike/trek and is easy to travel with.

Stephen P.

12/03/25

Simple and functional

Well constructed and sturdy. Will definitely be capable of putting up with being packed and repacked on any kind of excursion.

Michel L.

26/09/24

Solide et efficace mais beaucoup

Solide et efficace mais beaucoup plus gros que j’avais anticipé. Sera parfait pour la chasse.

Natasha K.

22/08/24

What a cool flask. Light

What a cool flask. Light & easy to carry.

Nancy T.

15/05/24

Belle flasque

Belle flasque pratique, bon format.
Bouteille transparente, idéal pour voir ce qui reste à boire !

Regis S.

21/09/23

Compact et résistant

Flask vraiment pratique et résistant avec son contour antichoc en caoutchouc. Facile à remplir et complètement hermétique avec son bouchon attaché à la bouteille ce qui évite de le perdre. Les graduations sont très pratiques pour mesurer les liquides.

Teek C.

20/07/23

Bought 4!! Fits in my hip pack

I got one for my self, and 3 for my cousins.
It’s perfect for walks, and just having water on you when you step out. It’s pretty durable, and leak proof. Would recommend this size, 6oz maybe too small.

Tyler T.

30/05/23

Stylish and practical, but a bit small

I use this on short hikes. It carries about 300 ml of water, which is enough for my small dog. It's light, it doesn't leak, the flask is transparent, the cap is attached (so you can't misplace it), and the edges have a grippy surface that makes it easy to handle. Would buy again, but I'd like to see a 500 ml version.

Marie L.

18/01/23

Flasque de 10oz

J'adore ma flash de 10oz.c'est la 2e que j'achète. Idéal pour transporter boisson ou amaretto sour 🙂

Tomas P.

25/10/22

Lightweight backcountry flask

Bigger of two from GSI, allows to carry more of your favorite "after the hike or ski" liquid.

GSI Outdoors

Boulder 10oz Flask

CAN $25.95

40 Reviews

Color: Orange

Size: OS

Select Color \/ Size

Orange / OS - CAN $25.95

Graphite / OS - CAN $25.95

Quantity:

In stock

Sold and shipped by Altitude Sports

Include our Lifetime Membership for $20.00 $34.99 to save 5% & get free returns (limited time)

Free shipping over $74 in Canada

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.

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
• Holds 10 fl oz; weighs 4.1 oz

Availability:

Worldwide Some exclusions apply

Reviews 4.8 star rating 40 Reviews

WRITE A REVIEW

Boulder 10oz Flask

Marketplace

Description