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Flexform 350

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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. Nice shape , Poor spout

      I just bought the Access 350 . Like the belt and the pocket phone fits great and room for keys also . Bottle is a nice size and ergonomically good however the drinking spout is very difficult to use whilst running ....very disappointing. on May 27th 2017

    2. Good Design Start but Needs Work

      I used these bottles during a recent marathon because they met the race regulations for holding 1 L of water or less. Unfortunately I had one heck of a time trying to get fluid out of these bottles and ended up finishing with almost two full bottles on a very HOT day. The plastic isn’t pliable enough and the bite valve is next to impossible to pull out and drink from. I coughed at least once or twice during my run because I was sucking air. Runners don’t have time and capacity to take a long pull on a water bottle. Fluid should easily come out of a bottle with little to no effort and quickly. I think this product has potential if Ultimate Directions makes some changes but otherwise I don’t recommend using these. Athletes shouldn’t have to work so hard to get water out of a bottle. on Apr 26th 2017

    3. 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

    4. 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

    5. 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