Free shipping over is valid in the US lower 48 states only, and is not available for PO Boxes or Military APO/FPO addresses.

Image 1

Related Items

Flexform 350

Current Stock:
Out Of Stock
A new generation of bottle - soft and ergonomic.

Specs & Details

  • Ergonomic shape is comfortable in your hand or against your body
  • Especially pliable plastic body
  • Soft silicone push/pull bite valve
  • Smaller and lighter cap, which fits both size bottles.
  • Weight: 1.96 oz. / 56g
  • Volume: 12.3 oz. / 350 ml
  • FDA-approved polyethylene (BPA-free)
New Badge: Yes
  • Product Reviews


    Write A Review

    1. MUCH better to grip!

      These are easier to grip and thus easier to pull out of the holster or put back in. I have struggled with the soft flasks and these are a perfect medium. Thanks UD! on Mar 8th 2017

    2. Not the best design

      I totally agree with other poster
      This was my first hydration vest
      Vest seems fine so far
      A little difficult reaching to the side pockets while running. But my issue was these bottles that came with the vest. I too couldn't figure out how to get the water. I even went to local trail running store. They didn't know either
      Said most folks switched out the bottles.
      on Feb 27th 2017

    3. How the hell do you use this thing?

      Bought it. Spent 5 minutes or so trying to intuition about how to drink from it. Something on it that said "bite and pull out tab to drink" would have been handy. Not real obvious. It does seem to produce water though. on Dec 13th 2016