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DESIGNED FOR PERFORMANCE 
Flask Included. Ready to Run
Two 500ml BPA-free soft flasks included—take them out of the box, fill them up, and go. No need to buy flasks separately like other vest brands

Breathe Through the Miles
Full mesh construction keeps air moving for lightweight ventilation. No thick padding, just breathable comfort for hot runs and humid trails

Zero Bounce. Zero Chafe
Adjustable straps lock in the fit. Flasks compress as you drink, so nothing bounces on technical descents. Soft edges prevent chafing during long runs

Premium YKK Zippers
Heavy-duty YKK metal zippers at this price point. Smooth operation, snag-free, built to last thousands of cycles


Training Days
Light enough for daily runs. Two front flasks included, soft edges won’t chafe.

Race Ready
Quick flask swaps at aid stations. Mesh back drains fast if you splash water

Hike & Run
Light enough to run, roomy enough to hike. Works as a daypack substitute

Long Distance
Rear compartment fits phone, jacket, 6+ gels. Built for 20+ mile days

I’m exactly 40 inches. Should I order Medium?
If you’re exactly 40 inches, Medium will be very snug. Since this is a performance fit designed to be tight, we recommend waiting for a larger size if you prefer any room for comfort.
How do I know if I have a “long torso”?
If you’re 6 feet or taller, or if regular shirts often feel too short on you, you likely have a long torso. This vest may ride up during running. It’s designed for average torso length.
I wear a Medium shirt. Will this fit?
Shirt size doesn’t determine vest fit. Please measure your actual chest circumference over a running shirt. Many Medium shirt wearers have 38-42 inch chests – only 38-40 inches will fit this vest comfortably.
Can I return it if the size doesn’t fit?
Yes, standard Amazon return policy applies. However, to avoid returns, we strongly recommend measuring carefully before ordering. This is a snug performance fit, not a casual vest.
My chest is 38 inches but I’m worried it’s too tight. Should I size up?
38 inches is within the Medium range. However, this listing only offers Medium size. The vest is designed to be snug to minimize bounce. If you prefer looser fits, this may not be ideal.
HYDRATION VEST FOR RUNNING — MEDIUM SIZE FIT Designed for chest circumference 36-40 inches. This lightweight water vest for running provides a snug performance fit for slim to athletic builds. Measure chest over running shirt before purchasing
LIGHTWEIGHT WATER VEST WITH DUAL SOFT FLASKS Only 8 ounces ultralight design. Includes two 500ml BPA-free soft flasks with leak-proof caps. 5L total storage for essentials with quick-access front pockets during trail running and marathons
RUNNING HYDRATION VEST — DUAL FLASK DESIGN High-density nylon mesh for moisture-wicking breathability. Snug fit minimizes bounce during ultra running. Adjustable chest straps for secure fit on technical terrain
RUNNERS VEST — DURABLE CONSTRUCTION Heavy-duty metal zippers with smooth operation. Reinforced stitching for long-lasting durability. Multiple compartments for phone, keys, nutrition, and running gear. Designed for men and women runners
TRAIL RUNNING VEST — SAFETY FEATURES Reflective strips on back for low-light visibility. Built-in emergency whistle. Ideal for trail running, ultra running, marathon training, hiking, and long-distance outdoor activities
8 reviews for Running Hydration Vest 5L with 2x500ml Soft Water Flasks – Ultralight Water Vest Pack for Men Women – Breathable Marathon Vest
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