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Fitting onto 12oz and 21oz standard mouth Hydro Flask bottles, the Standard Mouth Sports Cap allows quick drinks with a quick pull of the squeeze-bottle-inspired mouth piece.

  • BPA-free polypropylene material doesn't leach plastic residue into your body
  • Top cap loop still allows you to hang your water bottle with carabiner or backpack strap
  • Beware, the pull mouth piece is NOT leak-proof if you drop it into your pack or a dirty river
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easy pour

  • Familiarity:I've used it several times

This top fits with any of the Hydro Flask "standard mouth" bottles. This is the one that I use it with: http://www.backcountry.com/hydro-flask-21oz.-standard-mouth-water-bottle?ti=U2VhcmNoIFJlc3VsdHM6aHlkcm9mbGFzazowOjM

IF you have a full bottle of water with this cap, be sure that you store your bottle upright otherwise water will leak out! The leaking comes from the little gasket/rubber piece that is located in the loop or circular portion that you can see in the picture. Without this air hole you would not have any suction so thats why its there! Other than the leakage, it is a great piece to have especially if you're on the go.