REI Co-op Trail Hydro 20 L Hydration Pack - Men's

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Just right for day hikes, the men's REI Co-op Trail Hydro 20L pack has a 2-liter reservoir and a Quickload pocket that makes it easy to load a full reservoir, even if the pack is stuffed with gear.

  • Features

    • Hard-sided Quickload pocket eases sliding the reservoir into a full pack, and protects the reservoir from damage; pocket folds flat when not in use
    • 2-liter HydraPak reservoir has a flexible, non-kinking, 36 in. Hydraflex™ drink tube to provide a steady flow of water
    • Made with lightweight, abrasion-resistant, BPA- and PVC-free thermoplastic urethane and RF (radio-frequency) welded seams for durability and elasticity
    • High-flow bite valve self-seals after each sip; twists on/off to prevent leaks when not in use
    • Stretch-mesh, exterior side pockets hold water bottles or anything you need to get to quickly
    • 20-liter gear capacity gives you room for the 10 essentials and plenty more for a day on the trail
    • Sternum strap, padded shoulder straps and removable hipbelt offer a comfortable carry
    • Soft pocket for sunglasses or phone on top of pack
    • Zippered mesh pocket with key keeper inside pack for small essentials
    • External daisy-chain attachment points let you attach trekking poles and other gear to the outside of your pack


    View the REI Co-op Trail Product LineView all REI Co-op Daypacks
  • Technical Specs

    Best Use


    Frame Type

    Internal Frame

    Gear Capacity (L)

    20 liters

    Gear Capacity (cu. in.)

    1,220 cubic inches

    Reservoir Compatible


    Reservoir Included


    Bottle(s) Included


    Liquid Capacity (L)

    2 liters

    Liquid Capacity (fl. oz.)

    67 fluid ounces


    1 lb. 12.8 oz. (not including reservoir)

    Fits Torso Length (in.)

    17-20 inches

    Fits Waist/Hips

    28-42 inches


    Nylon/recycled nylon (bluesign® approved)

    BPA Free


    Frame Material

    EVA foam

    Pack Access


    Number of Exterior Pockets

    5 + main



    Bite Valve Shut-off Switch



    19 x 12 x 7 inches




    Contains materials that meet the bluesign® criteria

    Contains recycled materials

  • Reviews
    9 reviews with an average rating of 4.3 out of 5 stars

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