DCIM100GOPROHydration system preferences are about as subjective as running shoes.  In other words, every single runner has a strong feeling about what they like and don’t like, but no single product is perfect for everyone.

My philosophy with most running products, hydration systems included, is that if it works and is comfortable to you, then that’s what you should be using.

Which is why I hadn’t switched my hydration system in a long time.

For the past several years I’ve been using the Nathan HLP 008 Vest for long runs, and a simple handheld for anything under 2.5 hours.  Recently I added the Ultimate Direction Jurek Essentials belt (an xmas gift from the lovely wife), which, in combination with the handheld, gives you plenty of storage space for light fuel and liquid on medium-length long runs.

But the hype around the 2012 launch of the Ultimate Direction Signature Series packs, which includes the smaller Anton Krupicka Race Vest, a slightly larger Scott Jurek Ultra Running Vest, and an even larger Peter Bakwin Adventure Vest, was so big and the packs look so sexy that I almost caved.  But I didn’t, I kept running with my trusty Nathan pack.

This year, however, I knew it was time for a change. I was planning some major outings and training for a 100 miler, and needed more room to carry gear than the Nathan could offer.  After a ton of research on other brands and packs, I settled on the UD Anton Krupicka Race Vest and asked for it (from my wonderful mother) for my birthday.  A few weeks later it arrived and I haven’t looked back.

Now you don’t see a lot of review posts on Rock Creek Runner because I don’t like to highlight gear unless I really believe in it.  I really believe in this pack.

After a few long outings, including a 30 mile run this past weekend, I feel comfortable reviewing the AK pack and throwing my support behind it.

Now for the info you’re really looking for…


The Obligatory Specs

Weight: An ultra light 7.0 oz

Capacity: 4.0 L

Fluid Capacity: The pack is designed to carry two bottles up front, and has a set-up to carry a water bladder in the back.  I haven’t tested the pack with a bladder, since the bottles up front have worked so nicely.

Sizes: They offer two sizes, a S/M and a M/L.  I use the S/M and it fits perfectly.

Ultimate_Direction_AK_Race_Vest_2Pockets and Features:

  1. Ultimate Direction Bottles
  2. Small Velcro pockets for electrolytes, valuables, or gels
  3. Bottle holsters with tightening cord
  4. “Smart Phone Compatible” pouches, too small for iPhone but perfect for small camera or MP3 player
  5. Main compartment with stretchable mesh outer

The Specifics You Really Want to Know

1) How does it fit?

In a word, great.

I’m not the thinnest of dudes, but opted for the S/M based on the sizing chart.  I followed the fitting directions located on the website, and the pack fit like a glove.  It’s low profile enough under the arms that you don’t know it is there.

2) How about the pockets?

As I mentioned above, this pack has a variety of pockets, including the two bottle pockets, two smaller pockets below the bottles, too medium sized “Smart Phone” pockets above the bottles, and the main compartment in the back.

During my most recent 30 mile run with the pack, here’s what I packed:

  • Main Compartment: Long sleeve shirt, a map, trail mix, energy bar x 2, almond butter packet, Gus x 2, and an empty hand held I used for the first several miles before stashing it in the back.
  • Bottle Pockets: Both UD bottles.
  • Small Pockets: In one I put two gels (could have held 3), in the other I put trash.
  • Medium “Smart Phone” Pockets:  My iPhone does not fit in the smart phone pockets, so I wasn’t able to put it in there. Instead I stored my GoPro camera (you know, for the action selfies!) in one and left the other empty.

All in all the only complaint I have about the pockets is that the medium pockets intended for phones don’t fit my phone.  The others are well placed, easy to access, and plenty large enough for an outing like the one I had.

The main compartment could have held much more than I packed in, which was unexpected.

3) What about the bouncing?

Have I mentioned how little bouncing I experienced yet?  I was truly amazed.  With heavy bottles up front, I felt certain I’d experience bouncing on the pack.

Thankfully, I was wrong.

The pack rides so well I often forgot it was there.  There was zero bouncing caused by the gear in the main compartment, and no noticeable bouncing from the bottles.  Sloshing, on the other hand, that’s a different story.  But I guess that’s unavoidable.

4) Any chafing?

After 30 miles I experienced no chafing.  I even purposely avoided putting on lube around the pack’s touch points so that I could see where the chafing would take place (and make sure to avoid it in the future). Amazingly, I had none.

The one issue I did notice was a bit of pressure discomfort on my chest from the bottles.  I didn’t notice this at all until the last 30-45 minutes of the run, so it wasn’t really an issue, just something that should be noted.

5) How about for women?

Honestly, I don’t know.  I’d imagine the bottle placement would need to be slightly adjusted, so I’d recommend trying on the pack and making any major adjustments before ripping off the tags.

Ultimate Direction has recently added a female specific line of products, designed by Scott Jurek’s wife Jenny, which includes a very similar vest called the Ultra Vesta.  If I was a woman, I’d definitely check that out as an option.

A Breakdown of the Good and Bad

What I Really Like:

  • The lack of bounce from both the bottles up front and whatever you have packed in the back.
  • Having the bottles up front. I wasn’t sure about this at first, but such easy access turned out to be very helpful.
  • The amount of space available in the back. It looks small, but I was able to pack a lot of stuff!
  • The strength of the materials.  Everything about this pack screams well-made, and I don’t feel like I need to be careful when it comes to ripping or over stretching.

What I Don’t Like:

  • The bottles themselves. I find it difficult to get water out, which is kind of the point.  Thankfully, any regular sized bottles will fit this pack.
  • The lack of a dry pouch. This was something removed in this second version.  It would be nice to have a small completely dry pouch for salt tablets and the like.
  • The fact that the smart phone pockets don’t fit my smart phone.  You can’t even fit an iPhone 4 in there, let alone a 5 or one of the larger Androids.  I know phone sizes are always changing, but the iPhone size should probably be a standard.

Conclusion and Recommendation

I’m a convert.

This is an incredibly solid pack for anyone looking to carry hydration and nutrition for longer outings.

If you already have the first version, I don’t think it’s worth upgrading.  The changes are small enough that I’d wait until your first one wears out before making the switch.

But if you’re in the hunt for a new pack, or looking for something a little different, the Ultimate Direction AK Race Vest gets Rock Creek Runner’s full support.

Ed Note: All links to products are affiliate links.  Purchasing anything through one of these links kicks a few pennies in the RCR bucket to help keep the site up and running.  Thanks for your support!

Author Doug Hay is the founder of Rock Creek Runner, host of the Trail Talk podcast, and fanatical about everything trail running -- beards, plaid shirts, bruised toenails, and all. He and his wife live and run in beautiful Black Mountain, NC.

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6 thoughts on “Ultimate Direction AK Race Vest 2.0 Review

  1. glad to hear the bouncing is minimum in the updated version. i stopped using the older version because of the bottle bounce and bruising on my ribs. maybe i’ll give this one a shot.

    1. Hey Nick –

      Yeah, I expected significant bounce, so was really happy when I didn’t experience any. Like I said though, sloshing is another issue. I don’t know if I noticed it more because the bottles were closer to my face or if handhelds just slosh less, but it felt much louder than carrying two handhelds.

      I don’t know what pack you’re using now, but if you’re looking for another, I’d give the 2.0 a shot.

      Good luck at TJ 100k!

  2. I have the women’s version of this and love it! I agree, I had to swap out the bottles, but I love having them in front. I’m actually looking for a larger pack now (for the commute to work) so I appreciate your mentioning which types of UD packs run larger.

  3. the more i read about this, the more convincing it gets. I use the salomon XA 10+3 thing, but it can get bulky (i tend to pack more than i need really). I do use a bladder (though it seems to be feasible here too) for longer outings with the addition of some electrolytes mixes in soft flasts in the front pockets. And this is what i wanted to mention here: you can try salomon’s (i think UD is now selling them too) soft flasks (the larger ones, 450ml or so) to replace the rigid bottles at the front. It will solve your sloshing issue, guaranteed.

  4. Just experienced my first run today with my new AK Vest 2.0. Like all of you guys, I was surprised by the minimal bouncing. The vest itself was bouncing a bit, but not the bottle. Regarding the sloshing, I guess there’s not much to do.

    Any suggestions for a top-notch adjustment and fit?

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