Ultraflask, 600ml soft flask, 20 oz, by Orange Mud

What can I say!! I purchased two of the 600ml soft flask for my Endurance pack and they are perfect. I use both for fuel and fluid. These guys at Orange Mud know what athletes need. The Orange Mud athletes use every product they sell.

The 600 ml flask fits perfectly in the front pocket of my Orange Mud hydration vest. I can have Tailwind in the flask and 2L of water in back for all my long run hydration needs.

I love the Hydration pack because it stays more secure when running then the vests. I love being able to sip on the fly.; less to deal with when drinking.

The flask is cool as well for those days you don’t need as much water, but still want the pack to carry “stuff.”

I like the larger capacity. The straws took some getting used to, as they are slightly in my line of sight with the vest I use.

This soft flask worked really well with the "Gear Vest Pro". You are able to store this in one of the front pockets, and very easy to use. I was able to have endurance fuel in the "Gear Vest Pro" bladder, and had water in the "Ultraflask". This all worked great on my 18 mile run. With enough fluid left where I think this setup could work well for a marathon distance.