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Free UK delivery if you spend £45 or more
Free UK delivery if you spend £45 or more

Boulder Flasks

Simply the coolest, most practical and stylish water bottles you can buy.
  • GSI Boulder 10 Flask graphite
    GSI Boulder 10 Flask colours
    Sold out

    Boulder Flask

    £ 26.50
    £ 19.75

    Your favourite drink can now go anywhere and take any fall with this sleek bumper hip flask from GSI Outdoors. The stylish Boulder Flask holds 296m...

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    £ 26.50
    £ 19.75
    Sold out
  • GSI Boulder Flask Large Red open lid
    GSI Boulder Flask Large Red
    Save 9%

    GSI Boulder Flask - large size - 16 fl oz

    £ 33.00
    £ 30.00

    Your favourite boulder flask has grown up and is now bigger. This GSI 16 oz boulder flask is tough, stylish, brilliantly designed and now large eno...

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    £ 33.00
    £ 30.00
    Save 9%