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Standard Mouth
Standard Mouth Flex Straw Cap
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Standard Mouth

Standard Mouth Flex Straw Cap

Size Chart
Hydro Flask Pack Size Chart
Available Sizes S / M M / L
Torso
Measurement		 18 - 19 in 19 - 22 in
43 - 48 cm 48 - 56 cm
Hip
Measurement		 22 – 46 in 26 – 46 in
56 – 117 cm 66 – 117 cm

  1. 1. Torso Measurement

    • A. Bring your chin to your chest and feel for the most prominent bony bump where the slope of your shoulders meets the back of your neck. This is your C7 vertebra, and the top of your torso measurement.

    • B. On each side of your body, feel for the top of your hip bones, just below the sides of your ribs. With fingers pointing forward and thumbs pointing backward, draw an imaginary line between your thumbs. This is the bottom of your torso measurement.

    • C. Stand up straight and have a friend with flexible measuring tape measure the distance between your C7 vertebra and the imaginary line between your thumbs. That’s your torso measurement. If you are between pack sizes, go with the smaller size.

  2. 2. Hip Measurement

    While your torso measurement is the best indicator of your pack size, it’s still important to check your hip size when using a hipbelt. To find your hip measurement, wrap a flexible tape measure around the top of your hip bones, just below the sides of your ribs. This measurement is slightly higher than your waistline

Similar Standard Mouth Products
  1. Small Flex Boot Small Flex Boot
  2. Standard Mouth Sport Cap Standard Mouth Insulated Sport Cap
Standard Mouth Flex Cap
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Flip and Sip.

    Hydration on the go just got easier with our leakproof, insulated Flex Straw Cap. Add it to your favorite Standard Mouth Hydro Flask bottle to easily enjoy cold hydration anywhere.

Product Benefits

  • Standard Mouth Flex Straw Cap fits all Hydro Flask Standard Mouth Bottles
  • Straw is easy to trim to fit your favorite Hydro Flask
  • Flex Strap is easy to transport and comfortable to carry
  • Honeycomb™ Insulated cap for maximum temperature retention
  • Leakproof when closed so you can reliably sip and transport your refreshment without worry
  • BPA-Free & Toxin-Free
  • Removable components for easy cleaning.
  • Also compatible with Small Flex Strap Packs

Care & Use

  • Dishwasher safe, or use our Straw & Lid Cleaning Set
  • Not intended for use with carbonated beverages.
  • Flex Straw Cap not intended for use with hot liquids.
  • Keep hot liquids out of the reach of children.
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We stand behind our products.

Hydro Flask guarantees this product with a limited lifetime warranty against manufacturer defects.

Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars donated donated.
  • 26,043 Bottles donated bottles.

Hydro Flask supports non-profit organizations focused on building, maintaining, restoring, and providing better access to parks. Since 2017, we have been doing just that:

  • 92 Non-profits supported non-profits.
  • $1.5 million Dollars donated donated.
  • 26,043 Bottles donated bottles.