FITLY Soft Flasks

Size Guide

Ideal for quick drinks on the run. Gobble up a gel, wet a dry throat, or rehydrate. Designed to be used while running, and all of us who can't stay in place!  Stores 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

    The models to choose from:

    • F1 (5 oz 150ml - 5.5 x 2.75 in): small enough to fit in FITLY's SUB45 front pockets for quick access.
    • F2 (8.5 oz - 250 ml - 7.5 x 3.5 in): when you need a little more.
    • F3 (12 oz 350 ml - 8.75 x 3.5 in): longer flask. Same width as FLASK250. 
    • F4 (13.5 oz  400 ml - 8 x 4 in): go farther, take more.
    • F5L (17 oz  500 ml - 9 x 2.75 in): the only round bottom flask. Load up!
    • F5 (17 oz 500ml - 8.5 x 6): a low profile bladder that fits perfectly in the Sub90's thermo-compartment.  Can also be used as a standalone with the included screw-on mouthpiece included. Comes with a 23 in (58 cm) long tube and silicone mouthpiece.  Important: F5 is made to fit the SUB90 and is too big for the SUB45.
    • F11 (37 oz 1100ml - 12 x 6.5): an ingeniously low profile design to use with the Sub180 or as a standalone flat soft flask (screw-on mouthpiece included).  Important: F11 is made to fit the SUB180 and is too big for the SUB90 or SUB45.
    • F17 (60 oz 1750ml): our regular larger bladder for all your adventure and day packing.  
    • COMBO = F1 + F2 + F4
    • ALL IN COMBO = F1 + F2 + F3 + F4 + F5L

    How to use:

    The mouthpiece or nipple has a soft and hard section. Softly bite the soft part to release the liquid - press on the flask or 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.


    Find the right band size