Alpha 5.0 Race Vest

(6 customer reviews)


The award-winning Alpha series is the pinnacle of design, functionality, and comfort. Building on the ErgoFit design and expanding on successes of the fourth iteration, the Alpha 5.0 focuses on past design strengths while introducing new functional changes. This 6-liter race vest has 9 pockets accessible on the go. New cord locks on the Z-pole attachment allow for easier access. Updated magnet positioning on the passage pocket provides more capacity for larger items. The passage pocket has been updated to a nylon polyurethane coated fabric which keeps its contents dry. Updates to the side zipper pockets allow for easier access. In addition, another layer has been introduced which adds a quick stash pocket underneath the zippered pockets. The front harness bottle pockets are now taller allowing for a wider variety of bottle options. The pocket mesh has also been updated to a powernet mesh which gives more stretch and added durability. The overall body mesh has been updated to the UltrAcool Light Mesh for a more breathable on-the-body feel. Available in three sizes.

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SKU: UA132BU Categories: ,


  • Rapid access pockets
  • UltrAcool Light Mesh
  • Large zipper pulls
  • Dual sided removable insulated reservoir compartment
  • Extra soft no chafe binding
  • Secure drawstring pocket
  • Large & flat front pockets
  • Easy access passage pocket
  • Double layered 30D fabric reinforcement at the stress points
  • Trekking pole attachments

Weight: 9.6 oz (272 g)

Colors: Blue/Cherry Tomato

Sizing Range: Sm, Md, Lg

Volume: 366 c.i. (6L)


ErgoFit: The human body is complex with intricate detail and function. The same attention to detail is present in the design of our packs to enable precise movement, contact, and weight distribution which ensures that there is never any inhibition to the biomechanics of the human body.

  • Shoulder straps: Human shoulders aren’t straight, so a pack’s shoulder straps shouldn’t be either. Longer straps allow the back portion to sit deeper on the neck to prevent any rubbing. This addition in length helps to create slope as the straps come over the top of the shoulders and around the neck following the natural curve of the body. The harness then follows an S curve around the arms and chest area to avoid any hindrance to the running motion.
  • Weight Distribution: The harness construction also helps to keep the pack balanced at any capacity to ensure the same high quality fit empty or fully loaded. In regards to balance, the load is positioned lower on the back closer to the body’s center of gravity, the hips. This placement helps to stop unnecessary energy expenditure during the long haul.

Ultracool System: When the human body exerts force, 80% of the power it generates is converted to thermal energy. This means that most of the energy you use when running, climbing, or doing anything else is lost and becomes heat. The hotter you are, the worse you perform. The Ultracool System is a collection of technologies designed to dissipate heat and keep you cool. This system allows you to maintain a lower body temperature by dispersing heat during intense activity, keeping you performing at the highest level.

  • Small Footprint: Anatomically engineered, the pack covers only what is necessary on the body to keep it secure thus allowing for your temperature to remain cooler during heavy energy exertion.
  • Ultracool Mesh: The most breathable mesh on the market, this 3-layered, large holed honeycomb mesh is made from polyester which helps to draw moisture away from the skin without absorption.
  • Insulated Bladder Compartment: Made of Mylar, the insulated compartment reflects and traps temperatures to help keep fluids hot or cold. Additional foam with air pockets creates more space for the insulation to take effect.
  • Max02™ Sternum: The Max02™ Sternum is a shock cord securing system that helps create a comfortable & natural breathing pattern while at the same time keeping the pack secure. The shock cord allows for stretch outward and 100% rebound which keeps the pack snug against your body empty or fully loaded with no restriction of movement.



Additional information

Weight .6 lbs
Dimensions 5 × 2 × 5 in

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6 reviews for Alpha 5.0 Race Vest

  1. Greg M Wilson

    I loved my Alpha 4.0. Barely had any complaints with it, and the complaints I do have I didnt know I had until I bought the Alpha 5.0. I ran a 20 miler in 100% humidity with the Alpha 5.0 on a test drive last week. It breathed amazing, and when I finally caved in and took my shirt off I was thrilled with the lack of chafing around the waste (or anywhere). There were also so many pockets. I rarely filled all the pockets on the 4.0, but the 5.0 has even more storage space. The underside is also a very nice nearly clear white, so its very easy to see what’s packed away.

    I think Im down to one request with this vest, or the next iteration. Some accessory or built in way to easily clip my UltrAspire Lumen light to it so I dont need to wear a vest and lumen belt when running far at night.

    Bottomline: great vest so far.

  2. Michael West

    What a nice pack !
    I’ve been training in this pack ever since I got my hands on it. It’s light , fits really nice you really never know it’s on. Holds everything you need for a tough 22 or more trail run depending on the heat. So many comments to store things. I always love watching the videos and listening close bc the guy really has never steered me wrong. If your looking for a pack to carry lots of stuff two bottles up from and a bladder in the back that rides great thirst is the one . The expandable mesh they use is great.

  3. Jeff Huget (verified owner)

    Outstanding vest. Ran 40 miles in the heat using 2x ultraflasks and a 2L bladder. The bladder attachment and hose control is fantastic – super quick to change bladders, holds perfectly during the run. I used all the pockets and pole cords and everything works really well. One of those products you can tell the designers use the product too. Quality of materials (fabric, attachments, zippers) is very good. Highly recommended.

  4. Disappointed female (verified owner)

    I was so excited by all parts of this new vest – pockets galore, martial, etc. But the one thing that I thought was the no problem for race vests in this day and age was the phone pocket. I have no idea if really tall people who are giving this 5 star ratings don’t have this issue, but as a 5’4 female, the phone pocket CANNOT work. Imagine someone slamming a hard object in to your collarbone every not-hiking step that you take. Well I don’t have to indulge it bc I put the phone in the special phone pocket and had to either walk or leave the phone in an unaccessible back pocket to not be in pain. If the water bottle pockets were stretchy, I would put the phone in one of those but since they’re so large for the bottles, the phone won’t fit snugly there. I have no idea how anyone my size could run a step in this pack with their phone in the designated phone pocket.

  5. DJ

    WOW! This pack is such a heavy hitter from the get go! Perfect snug fit with available breathability with the ERGOFIT bunge system. I wanted a pack smaller then the ZYGOS and bigger than the Momentum for races over 50 miles!! This vest delivered and then some. Carrying enough water, nutrition and extra’s that needed to be carried during the later stage of the race when I may need something during the middle of the night if I had not made an aid station yet. Whether I am carrying light or packed down the vest rides well with little to no issue with movement. I am 5′ 11″ and around 195 lbs and the large fits me well. I am able to reach the pockets needed during a race or training run and if needed on longer races I’ll pair with the fitted belt to keep nutrition easier to grab and also load more if needed. All in all the vest did exactly what I needed and then some. Well worth the investment!

  6. EN

    Exceptional piece of gear. Honestly, I was a bit concerned if it would fit (I’m 6’2 and 225). Other vests I’ve tried have been just too tight when fully loaded. I knew that it wouldn’t be a problem when I tried this on. Plenty of room for a Clydesdale like me. Well-designed pockets. Great layout. Quality product. No chafing around the neck and I love the over-sized pockets on the front for any kind of water bottles. You can tell this vest was well thought out and improved from the last one. Well done Ultraspire.

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