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Active Skin 4L Set Hydration Vest

4.818181818181818 out of 5 stars
44 Reviews

Out of Stock

Don't worry though, we have a lot more Hydration Packs in stock than that.

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Why We Like The Active Skin 4L Set Vest

For running on less-intimidating trails, we wear this low-volume vest that prioritizes comfort and carries everything we need. The cut of this pack conforms to the body for a bounce-free fit that avoids causing friction or overheating. With modular storage and easy access to our water and other essentials, we feel prepared and confident on every run.


  • Optimized trail running vest for taking on shorter routes
  • Included soft flasks fit in chest pockets for ease of access
  • Pack is compatible with a 1.5-liter bladder for extra hydration
  • Body-conforming fit prevents bouncing and allows freedom of movement
  • Unique sternum strap construction provides easy breathability
  • Elastic cords and loops provide versatile carry options
  • Reflective details provide extra visibility on nighttime runs
  • Item #SALZ9O3
[body] 100% nylon, [back body] 100% polyester, [back insert] 89% nylon, 11% elastane, [body insert] 88% nylon, 12% elastane, [lining] 100% nylon
4L (244.1cu in)
Shoulder Straps
EVA padded
Hydration Compatible
2 front flask pockets (flasks included), 1.5L bladder sleeve
Reservoir Included
2 500ml soft flasks
chest, side
[external] 2 front flask, 2 front stretch, 1 front zippered, 1 back zippered compartment, [internal] 1 zippered, 1 bladder sleeve
Trekking Pole Carry
customizable postion
[back length] 15in
Claimed Weight
7.1oz, [including accessories] 9.5oz
Manufacturer Warranty
2 years

Overall Rating

5 based on 44 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 8 reviews
5 Stars - 36 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

July 2, 2024


I love it!!!! so comfortable you don't even notice that you are wearing it


Originally reviewed on

5 out of 5 stars

July 1, 2024

Light weight and lots of pockets

I bought this vest around a month ago to start my running era, and I’m so glad I did, it’s light weight has lots of pockets and it’s cute 🥰. I’m big on quality and this has it. I’m 5’5 around 160 pounds with a pear shape, I got a small and it fits perfectly !


Originally reviewed on

5 out of 5 stars

May 2, 2024

Good value and fits well

I've used it several times
Size Bought:

This running vest fits snugly and doesn't chafe. It is a little difficult to get the water bottles into the sleeves, but once they are in, it works well. I bought the men's XS, and it works well for me as a woman who generally wears S in women's tops.

5 out of 5 stars

February 16, 2024

Light and comfy

Perfect for the shorter runs, fits the flasks easy.


Originally reviewed on

5 out of 5 stars

October 16, 2023

Perfect for long runs !

I can bring my electrolytes, gels and candies to carb up and stay hydrated during my longer runs. It's light and does'nt feel like I have a vest on !


Originally reviewed on

5 out of 5 stars

August 24, 2023

Light and comfortable

Perfect product that gets the job done! I usually wear a L, sized down to a M and the fit is perfect. Not too tight, and doesn't restrict arm mobility. Used for many runs (long and short) and it has held up perfectly,


Originally reviewed on

5 out of 5 stars

August 12, 2023

Perfect for the medium distance run

Perfect compact running pack for those on the skinnier side


Originally reviewed on

5 out of 5 stars

August 5, 2023

Light and Comfy

I bought this last year when I started trail running. I have also used it occasionally for long xc skis because it is so easy to stow stuff but also i can easily access water and snacks from the front pockets. I am a sweaty runner, no issues with rubbing anywhere and it doesn't jostle. Great value!


Originally reviewed on

5 out of 5 stars

August 1, 2023

Perfect for me

This is a bit on the smaller side which is exactly what I wanted. I only need to carry a packable waterproof jacket and some running gels (and of course my water). For a 50k or under this meets my needs well. It's comfy and doesn't move around or rub my skin anywhere.


Originally reviewed on

5 out of 5 stars

July 23, 2023

Amazing bag

So happy with my purchase. It's great. It's really well design and holds on great. I'm 6'2 and 175lbs and the XL is a perfect fit. I can bring enoug nutrition, keys, phone and more to my ultras.


Originally reviewed on