Epic Hydration Backpack

Rated 4.50 out of 5 based on 4 customer ratings
(4 customer reviews)


Over two years in development—it will see time this year in the White Cloud Range in Idaho and the John Muir trail in California; Prototypes have been in the Marathon de Sables, the Tor des Géants, Ultra Bolivia Race, and countless other self-supported adventures all of which have been proving grounds for the Epic. The Epic hydration backpack is a lightweight, energy conserving, large-scale hip leveraged pack compatible with long, or multi-day self-supported endeavors. The Epic includes a rain cover and comes with 2 550 mL UltraFlask Hybrid Bottles, this hydration pack can also support a massive 3L reservoir and has waist and top loading compartments for all essentials.



Recommended Use:
Fast high mountain ascents to multi-day self supported adventures.


  • Classic Alpine style top loading pack.
  • Zippered top pocket.
  • Side compression straps.
  • Elastic mesh quick stash pocket with dual quick release compression straps.
  • Wrap around waist belt stabilizes a fully loaded pack, with single adjustable speed hook closure and zippered elastic power net mesh pockets.
  • Classic vest styled shoulder straps.
  • Dual lower elastic mesh front pockets come standard with two 550mL soft touch UltraFlask™ bottles.
  • Proprietary large-holed mesh, made of soft microfiber polyester for comfort and breathability.
  • Soft and supple perimeter binding made with polyester to wick away moisture, and stay comfortable against bare skin.
  • Dual Max O2 Sternum™: A hook-type attachment system with enhanced recoil for better range of motion, and quick in and out.
  • Upper open mesh front pocket with draw cord for smaller flasks or multiple packets of energy gel.
  • Enlarged zippered upper front essentials pocket for keys, credit cards or other secure items.
  • Shock cord attachment loops at bottom of pack for access to Z-poles or other essentials on the go.
  • External ice ax/hiking pole loops with shock cord attachments.
  • External sleeve for access to hydration reservoir up to 3 L. (Sold separately).
  • Includes rain-fly which tucks away in bottom pocket.


Fit:  Unisex
Size:  Universal (Chest Size: 28″-48″)
Color options:  Luminous Blue/Precipitous Blue or UltraRed
Hydration (included):  2 x UltraFlask 550
Reservoir Compatible (not included):  Up to 3L
Capacity: 1526 c.i.; 25 L

Additional information

Weight N/A
Dimensions N/A


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Fluid Capacity

2x 550mL UltraFlask bottles

Weight (includes bottles & rain cover)

28.92 oz 23.4 oz (664 g)

Total Volume

1525.6 c.i. (25 L)

Product Dimension (inches) LxWxH

4 reviews for Epic Hydration Backpack

  1. Rated 5 out of 5

    Jason Poole

    Barkley Marathons is quite the event. This year was my 7th time to tackle this beast and twenty years since my first attempt (1996). I banged out another 3-loops this year (roughly 78 miles and 40,000 feet of climbing) wearing an Epic pack from start to finish. Not only did this pack work flawlessly for the entire 42 hours, 5 minutes of racing, but it also carried me through the non-stop, 205-mile Tor des Géants race in the Italian Alps. This pack is designed with adventure in mind and will delight the wearer! Functional to no end!

  2. Rated 4 out of 5


    Anybody who knows me knows I’m a HUGE fan of UltrAspire. I was stoked for many many months waiting for the Epic that would have a bit more space than their ‘more than epic’ Fastpack (epic 25L / fastpack 18.29L). The Epic is the inline replacement for the Fastpack and is in itself a fantastic pack. The Epic is much lighter while allowing for more space which is pretty cool. Gone however is the Body Rhythm harness which allowed the pack to move much better with the body IMO. A traditional cinch top replaces the Fastpack’s zipper closure, but doesn’t really provide a tighter closure. There are ‘epic’ upgrades, like the Dual Max O2 Sternum™, rain fly cover, external ice ax/hiking pole loops with shock cord attachments, compression straps, and an upgraded harness layout. It fits and performs as well as any UltrAspire pack which is outright amazing. I do miss the side bottle pockets the Fastpack had because they provided great options for where/how I carry water/essentials (which I feel could have been adapted for the new ultraflask bottles while still expanding the capacity of the main compartment), the body rhythm part of the harness, and I miss the zipper opening that really allowed you to get deep into the pack, (which I feel could work easily with a drawstring closure as well to provide a smaller closure). The epic is by far one of the best performance packs out there and I don’t think anyone could go wrong owning one. It is lighter which is huge for many athletes. It easily stands up to most tasks you would demand of it. Having been spoiled by their Fastpack, I feel (personal opinion), that many of the features the Epic provides could have been introduced to the Fastpack making a truly epic pack, OR it could have been placed inline in addition to a slightly updated Fastpack as a larger race pack line option instead of as a replacement. Four stars only for how the Fastpack performs better for my needs than the Epic.

  3. Rated 4 out of 5

    chris mcgovern (verified owner)

    4.5 stars.
    I literally went on a 36 hour trip upon receiving this pack. I was delighted with how everything I needed packed right into it without getting too creative. Pack fit me great, adjusted great and after 12 mile hike/jog to our camp site I was pleased. We did about quite a few more miles on the trip and the pack was flawless.
    I had too minor issues with my pack. Top lid shock chord lock thing stopped working, no big deal and probably a fluke. The other issue was a little tear or separation of the material on the waist belt. I appreciate the dedication to the light weight use of materials, but I think that inside belt material might be too frail. I will put this pack to much much more use. Thanks

  4. Rated 5 out of 5


    I loved the Titan and Titan 2.0 for my long runs. However, in the shoulder seasons I wanted the ability to bring a few additional emergency items (down jacket, bothy bag, etc) in case sh*t happened. I tried the UD Fastpack 20, but with that volume of gear, it just wasn’t stable and could really have used a waist belt. I sold it and picked up the Epic. It was a night and day difference. The front and waist pockets allow access to everything I want while on the move and the back packed everything else. If I had to nitpick I would wish this came in multiple sizes like all other running packs. I have a 34″ waist and there was a lot of waist strap material that could have been better utilized into larger waist pockets and I’m sure different torso sizes would be well appreciated. That said, I love this pack and will continue to enjoy many get-the-hell-out-of-Dodge adventures with it.

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