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Velo Hydration Vest
If you already own a hydration vest, you can simply replace your bladder with one of the MXXY Flexx Hydration Systems. If you don't own one, you can snag the MXXY Velo Hydration Vest which includes the Flexx Hydration System. With the total capacity of the vest being certified insane, we found it to be lightweight enough for trail runs and gravel adventures, but still enough fluid for long hikes. While there are definitely more lightweight hydration vests out there, which would be more suitable for racing, we appreciated the amount of storage in this vest. We have definitely found it handy during long days in the mountains.
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REVIEWS

Steve Kunst
I purchased the MXXY Enduro 9L Hydration Pack specifically to use on long bike rides or hikes. Here are my thoughts so far...
What I love: It's very easy to clean out the Flexx hydration system. The reservoirs are dishwasher safe, and they turn inside out for both cleaning and drying them. This makes keeping them clean so much easier than my other hydration pack bladders. The pulls on the reservoir zippers are also a very nice touch and make refilling them easier.
What I like: The quality of the pack and reservoirs are both good. I like that you can adjust the amount of fluid coming from each reservoir. The pack is comfortable and the added storage pockets are nice. The two zipper pockets at the front of the pack are great for storing and accessing snacks without having to take the pack off.
What I dislike: I couldn't access the rear pockets of my cycling jersey while wearing the pack. I keep my cell phone here and had to unbuckle the pack to get my phone out.