• Online:
  • URL for this product:
  • From the U.S. and CanadaCall 1-800-426-4840
  • Mon. through Sun., 4 a.m. through 11 p.m. PT.
  • InternationalCall 1-253-891-2500
  • Mon. through Sun., 4 a.m. through 11 p.m. PT. English language only.
Topeak MTX Trunk Bag EX


    Topeak MTX Trunk Bag EX

    Whether you're riding a road or mountain bike, this rear, rack-mounted storage bag from Topeak is great for commuting, errands and touring.

    • $69.95

    Item # 782331

    REI Members get back an estimated $ 7.00 on this item as part of their annual member refund.

    The REI Member Dividend

    The REI dividend is a unique benefit of membership in the REI co-op. It's comprised of your member refund—typically 10% back on eligible purchases—and/or your REI Visa® card rebates.

    Each March, active REI members and REI Visa cardholders who earned a rebate receive a refund in the form of an annual dividend notice.

    Only active members receive annual dividend notices. To maintain your active status as an REI member, you need to make net merchandise or shipping purchases of at least $10 per year, unless you joined that year. Member numbers are issued in one name and only that person receives the member refund. Your number can be used by others in your family, but it cannot be transferred to someone else.

    Questions? Call us at 1-800-426-4840 for more about your dividend or its redemption.

    Learn more

    Product size and color
    • 100% Satisfaction Guaranteed
    • Gear and Advice You Can Trust

    This item ships for free! Learn more

    To view videos or use the zoom feature on REI's websites, please download the latest version of Adobe Flash Player.

    • MTX TrunkBag EX attaches to your bike via a Topeak MTX QuickTrack™ rear rack system, sold separately
    • Features divided main compartment, 2 side pockets and multifunctional top pocket
    • Includes shoulder carrying strap
    • Comes with built-in carry handle and detachable shoulder strap
    • Reflective detailing increases your visibility in low light; includes an adjustable bungee cord on top and rear-light webbing clip in back


    Item 782331

    REI Membership

    Topeak MTX Trunk Bag EX Specs
    Best use
    Bike commuting & touring
    7.9 liter
    480 cubic inches
    13.8 x 8.3 x 7.5 inches
    1 lbs. 8 oz.
    Gear capacity (L)
    Gear capacity (cu. in.)

    Topeak MTX Trunk Bag EX

    Loading Ratings & Reviews...

    Rated 4.5714/5 based on 14 reviews
    Rated 5out of5
    by fromGreat Product Installed one on my wife's fold-up bike.
    Date published: 2010-09-21
    Rated 3out of5
    by fromToo Small for me Can't easily fit in a pair of shoes. Seems pretty nice otherwise.
    Date published: 2010-04-09
    Rated 5out of5
    by fromRoomy and secure We are recreational bikers who love to take off on a rail trail for a day. This trunk replaces a travel cooler bag that I strapped onto my bike rack with bungee cords. It always took several tries to get it attached without falling to one side, requiring us to stop and rearrange. Although I haven't taken this on a daytrip yet, it solidly slides onto the Topeak rack and stays there. Seems like the perfect size for carrying snacks, drinks, wallet, jacket, etc. I ride a comfort bike. I had to do a little adjusting when installing the Topeak rack. I needed to make sure there was room for the bag to fully click onto the rack behind the seat. In order to do this I needed to tilt the rack back a bit - requiring longer straps to attach to the seatpost. I just added a small piece of aluminum to make it work. My existing tail light attached easily to the Topeak rack, out of the way of the trunk.
    Date published: 2013-04-24
    Rated 4out of5
    by fromDoes what it should do. Great size for commuting. Fits well into the Topeak rack that I bought for it. No complaints.
    Date published: 2010-04-05
    Rated 4out of5
    by fromCommuting Profection I use this bag to commute to work, it is great for a small bag, doesn't hold much but it's size is perfect for tools, tubes, air pump, and clothes for the day... I purchased a shock cord net for the top to expand the carrying abilities, like shoes and so on... great purchase..
    Date published: 2011-10-27
    Rated 4out of5
    by fromIt does the job I got this to use with the matching bike rack that it locks into. That whole arrangement seems to work fine. Because of where the latch is for the rack the flap opening faces the back of the bike. If you are on the bike or holding it up by the handlebars, and turn around to get something out, the flap gets in the way. Other than that, it works to stash all my stuff.
    Date published: 2013-06-19
    Rated 4out of5
    by fromloves the attachment system There is STILL snow on the ground but I did slide the bag onto the Topeak Rack and that was nice. It's smaller than the bag I had on the rack which is what I was looking for. I like the external bungee system too. The rear loop for my clip on light is a nice feature too.
    Date published: 2014-03-05
    Rated 5out of5
    by fromGreat for casual riding Great bag and a perfect size for a snacks and other items during casual weekend riding.
    Date published: 2010-09-02

    Ask a question and have it answered by REI product experts and fellow outdoor enthusiasts. Need immediate assistance? Use Live Help.

    Loading Questions & Answers...

    How are we doing? Give us feedback on this page.

        FREE SHIPPING With $50 minimum purchase

        • Join REI today!
        • REI Membership
        • REI member benefits include an annual refund (typically 10% on eligible purchases).
        • Join REI today!
        • Sign up for REI Gearmail®
        • and get 15% off selected items!
        • Store Locator
        • Locate an REI store near you.
        • Find a Store
        © 2014 Recreational Equipment, Inc. All rights reserved. REI, the REI Tree and Mountain design, Novara, and
        REI Adventures are trademarks of Recreational Equipment, Inc.

        Find REI on: FacebookTwitterYouTubeFlickrMobile site