GSI Boulder 6 Flask


We believe comfort and quality should never be absent in the outdoors. Craft yourself an Old Fashioned from your favourite whisky or rye, a Negroni, a G&T, - what ever your favourite drop is; it can now go anywhere in the Boulder Flask. 

This smaller flask will fit in any pocket and there is no excuse for not carrying it.

Shatter-resistant, BPA free copolyester resin body and grippy, silicone bumper mean this flask can go the distance.


  • Wide mouth makes for easy filling, pouring and drinking.
  • Hinged top with silicone grip is easy to open and impossible to misplace.
  • Convenient moulded graduation marks.


  • Volume: 180 ml
  • Dimensions: 9.4 cm x 2.8 cm x 16.5 cm
  • Material: Copolyester, Silicone

Customer Reviews

Based on 2 reviews
Rugged flask for rugged adventures.

Nothing better then a cheeky nip at the end of your big day. And the GSI Flask is perfect for this. The downside is the clear sides, don't hide anything. So you can see when you're out of whiskey.

Shane Hughes
GSI Boulder 6 Flask

Awesome Flask. I have a few other hip flasks but this is now my go to flask for hiking or biking. Small size but surprisingly holds a decent amount of liquid (Tin cup whiskey currently) Easier to fill than other flasks too and gives a good pour plus I like how you can see how much is left and has an indicator on the side. Tough construction too, looks like it is built to last. Would definitely recommend. Thanks

Thanks Shane for you very helpful reviews. It makes us very happy to see the flask getting some good use too!

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