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Add one or several Nathan Fusion 8 oz Add-On Flasks to the Nathan Fusion Base Belt to create a customized hydration system. The updated 8 oz soft Super Flex Flask features Nathan's one-way valve Race Cap that opens and closes automatically, so you don't have to squeeze hard to get a sip.

*Compatible with Nathan Fusion Base Belt


  • Black (6509NB)
  • Cabaret Pink (6509NK)


  • Single 8 oz Super-Flex flask attaches to Nathan Fusion Base Belt via soft neoprene sleeve
  • Neoprene back adds comfort and prevents bouncing
  • Molded SpeedFit plastic holster makes it easy to grab flask quickly

Flask Details

  • Easy-squeeze 8 oz Nathan Super-Flex flask
  • Race Cap with high-flow, one-way valve opens and closes automatically for a quick swig; no need to squeeze hard to get liquid out
  • Cap seals well and prevents leaking
  • BPA-free and won't leech plastic taste
  • Bottle and cap are dishwasher safe on top rack

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