FITLY Soft Flasks

Size Guide

Custom made for your FITLY!

Ideal for quick drinks on the run. Gobble up a gel, wet a dry throat or re-hydrate. Designed to be used while running or biking.  Store directly in your front, side or back pockets. FITLY Flasks shrink as you drink so nothing ever moves, bounces or rattles.


  • No liquid bounce - Soft bite to quick flow
  • Shrinks as you drink
  • Leak resistant and rigid cap ring for easy refill
  • Light, durable, built to last - 100% BPA & PVC free
  • Ideal to drink on the go

    3 models to choose from

    FLASK150 (5 oz): small enough to fit in FITLY's Sub45 front pockets for quick access.

    FLASK250 (8.5 oz): a compromise between size and volume.

    FLASK400 (13.5 oz): for people who need to go a little further.

    How to use

    Softly bite the mouthpiece - press the flask - suck on the goodness!

    The more you press, the faster the liquid will exit. The walls collapse as you drink letting you absorb almost 100% of its content.




    Quick note: avoid mixing any liquid container with electronics. The product display is for stores only.

    Collections: SOFT FLASKS

    Sizing Chart

     XS/S = from 26 to 31 in. M/L/XL = from 31 to 40 in