REI Co-op Flash 15 Hydration Vest

$89.93Compared to $120.00*Save 25%
*Intermediate markdowns may have been taken.
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Color: Rockwall
Size: S/M

To move fast and light on the trail, keep your center of gravity tight. The REI Co-op Flash 15 hydration vest holds 1.75 L of water snug to your core while keeping you well supplied for your day hike.


  • Adjustable waist and sternum straps dial in the fit to keep your load tight and balanced
  • Breathable, padded mesh back and mesh shoulder straps help you stay cool on the trail
  • Included 1.75 L HydraPak Elite™ SL reservoir has Plug-n-Play quick-disconnect hose and high-flow Blaster™ bite valve that self-seals after each sip
  • 4 stretch-mesh chest pockets hold quick-grab items; they're also bottle compatible for more hydration
  • Zippered chest pocket fits most cell phones; 2 internal slip pockets and a key fob keep you organized
  • Top lid with adjustable strap lets you stash more gear
  • Locator device-compatible pocket at top of shoulder
  • 4 removable Packmod bungees can be moved to any loop on the pack to keep your load tight or to attach extra gear like trekking poles
  • 2 attached tool loops on bottom of pack can be tucked away when not needed
  • Made using bluesign®-approved materials, which conserve resources and protect the health of the environment, workers and wearer (you!)


View the REI Co-op Flash Product LineView all REI Co-op Hiking Hydration Backpacks

Technical Specs

Best Use


Gear Capacity (L)

15 liters

Gear Capacity (cu. in.)

915 cubic inches

Reservoir Compatible


Reservoir Included


Bottle(s) Included


Liquid Capacity (L)

1.75 liters

Liquid Capacity (fl. oz.)

50 fluid ounces

Number of Exterior Pockets

8 + main compartment


S/M: 14 ounces


Ripstop nylon (bluesign® approved)

Bite Valve Shut-off Switch


Fits Chest

S/M: 33-40 inches

BPA Free



16 x 10 x 8 inches




Contains materials that meet the bluesign® criteria

From a Climate Neutral Certified brand

36 reviews with an average rating of 4.5 out of 5 stars

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