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The Amphipod Full-Tilt AirStretch Velocity eliminates the discomfort associated with traditional bottle packs. The ergonomic 20oz Hydraform bottle rides comfortably and securely in your lower back with one-handed access from either side. The chafe-free and adjustable AirStretch™ belt keeps the pack from bouncing, helping you stay focused on holding the pace.

*Try with add-on Jett Cap for high-flow rate that's always open.


  • Black


  • Single ergonomic Amphipod 20oz Hydraform Bottle, BPA-free
  • Bottle rides laterally in your lumbar area for comfort
  • Bottle Bungee™ securely holds bottle in place
  • Comfortable and breathable AirStretch™ belt with quick-release buckle won't bounce or chafe skin
  • Padded AirFlow Mesh™ backing adds comfort and wicks moisture
  • Single triangular stretch pocket with zipper holds nutrition, phone, keys or other small essentials

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Customer Reviews

Comments: I love the water bottle, especially with the jett-squeeze cap. The buckles loosen a bit over time, but it hasn't bothered me too much. The bottle bounces when full, unless you tighten it down an uncomfortable amount. The zipper pocket is super stretchy, and can hold a large cell phone as well as a few gel packs, which is excellent.
From: Brian, McKinleyville, CA, USA. December 8th 2015

Comments: I have a 2 year old version of this. It doesn't stay at the tightness I set it to - the stretchy straps constantly pull out of the buckles - and I push it down at least every 10-20 seconds. I was so fed up on a recent fun that I ditched it behind a tree. I'm muscular and have a well-defined waist, and it simply won't stay below my waist...which means it interferes with my diaphragm while running.
From: Julie, Missoula, MT, USA. May 2nd 2014

Comments: The newer belt and connector are terrible. Very cheaply made and poorly designed. It broke after two weeks of use. Avoid this product...
From: Ken, West Texas, USA

Comments: Love this thing! Use it all the time - I hardly notice it is there. No bounce if you tighten the strap enough, and even then it is still very comfortable with the soft elastic belt.
From: Mitch, San Luis Obispo, CA

Comments: This flat-back bottle design is bearable -- literally and figuratively -- for almost all runners, even those who can't stand carrying around a bottle in any form.  It is virtually (though not 100%) bounce-free. And the company responds quickly to consumers, an added plus.
From: Barbara, Washington DC, USA