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In Stock & Ready To Ship — XT/Ultegra RT-MT800 Disc Rotors
Castelli Undersaddle Mini Saddle Bag
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Castelli Undersaddle Mini Saddle Bag

Mfg PartNum:Z8900104010
$24.99
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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Castelli Undersaddle Mini Saddle Bag

The Castelli Undersaddle Mini Saddle Bag is light with a sleek profile, sitting perfectly under your saddle. You may even forget it's there until you find you need it next. Constructed with water and stain-resistant materials to keep your belongings dry.

Features:

  • 5 x 13 x 5 cm
  • Water and stain-resistant materials
  • Water resistant zipper
  • Water resistant construction
  • Adjustable hook and loop attachment straps
  • Internal storage pocket
  • Reflective accents

  • B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    Mfg PartNum: Z8900104010 

    Bag Type: Saddle 

    Bag Capacity: 100 to 200 ci 

    Ordered by Most Relevant First
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    (83%)
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    Reviewed 12/21/2021
    by fouker
    Cycling Enthusiast
    SG
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    For holding spares only

    The longish rectangular shape of the bag requires recoiling the spare tube for better fit. I use the Continental Race Light tube as a spare so it takes up less space. Also comfortably fits a tire lever, 16g gas cannister, CO2 inflator, tube patches and a small multi tool. The zip is tight i assume for the water resistance. Its also not possible to unzip the bag whilst attached to the saddle as the strap attachment overlaps the zipline. As per description, this saddle bag is made to hold spares and tucked away.

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    Reviewed 10/21/2021
    by Anonymous
    Overall Rating
    1 of 1 customers found this review helpful.
    Perfect road saddle bag

    This is the ideal minimalist saddle bag. I have 1 700c tube w/80mm valve, two 16g CO2's, CO2 valve head, tire level, 6mm key for thru axle wheel removal and small baggie with extra valve core etc. I'd typically perfer not to have a saddle bag at all but this fill the void nicely. Snugs up very tight under the saddle with zero leg rub and zero movement of the bag while riding (we've all been behind "that guy" with the bag swinging back and forth). It's essentially invisible while looking down or in drops. A must have for roadie who isn't looking for a piece of luggage hanging off their seat. Yeah its small, as it should be. Must buy. Typical great service and delivery from BTD.

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    Reviewed 8/12/2021
    by Anonymous
    Overall Rating
    2 of 2 customers found this review helpful.
    Small & efficient

    This bag carries the essentials needed for a flat fix. It leaves room for my Garmin Radar light on my short seat post.

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    Thank you for your feedback.
    Reviewed 6/7/2021
    by Dan Houstin
    Cycling Enthusiast
    Tulsa OK
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    Tiny is the new medium

    Once you go tubeless on a road bike, as in not carrying a spare tube anymore, your old saddle bag is suddenly obsolete and oversized. This bag is perfect for the essentials. I have a CO2 inflator and two 16g cartridges, two tire levers, a minimal multitool, and two variations of tubeless darts, all nicely arranged in this little bag. It sits quietly and is easy to clean. The only downside I've noted is that the velcro on the strap wants to split. I've glued it back down for now, but at this price, I should probably just order a couple more bags and plan on a year each.

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    Reviewed 7/11/2020
    by Anonymous
    Competitive Racer
    Maryland
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    Best compact saddle bag ever. The search is over.

    Bought on sale for about $18 from BTD, incredible bargain especially if you compare it to the almost identical Rapha small under saddle bag that goes for $65.

    Mine is loaded with

    -Silca T-Ratchet & Ti Torque kit and bits (with homemade sleeve of light fabric and bits in a plastic holder)

    -one Park TL-4.2 lever

    -two 16g CO2 cartridges

    -one Continental Race Light tube 700-1825c 80mm presta (folded up tight)

    -PDW Tiny Object CO2 inflator (in a small ziplock bag)

    -one pack of Park glueless patches

    -one adhesive tire boot

    -one presta valve core removal tool and spare presta valve core (in a small ziplock bag)

    Even with all of the above, it's not over packed and it zips up easily. Though I could probably squeeze in some emergency cash or change, but that's about all it could fit in addition.

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    Reviewed 8/12/2021
    by Anonymous
    Overall Rating
    Small & efficient

    This bag carries the essentials needed for a flat fix. It leaves room for my Garmin Radar light on my short seat post.

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    Thank you for your feedback.
    Reviewed 3/18/2019
    by David K
    Cycling Enthusiast
    Portland, OR
    Value Rating
    Overall Rating
    A Great Little Bag

    The Undersaddle Mini Saddle Bag is light, adequately water proof, and just big enough for the essentials a wide road tube, a CO2inflator, some tire levers, and an emergency $5 bill. The size is small enough the bag completely sits underneath and within either side of saddle. I recommend this bag to anyone who wants a reasonably priced, minimalist saddle bag.

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    Reviewed 9/3/2020
    by Anonymous
    Overall Rating
    Great small bag

    I'm using on my Venge with aero seatpost. It works awesome and it's very small but enough for 1 tub, 1 CO2, a chuck and that's about it

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    Reviewed 6/7/2021
    by Anonymous
    Cycling Enthusiast
    Southern Oregon
    Value Rating
    Overall Rating
    the Perfect Small Saddlebag

    Well designed, perfect size for essentials, and the quality one would expect from Castelli.

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    Reviewed 4/12/2019
    by VeloBMC
    Cycling Enthusiast
    New Albany, OH
    Value Rating
    Overall Rating
    1 of 1 customers found this review helpful.
    Best smallish bag out there

    I hate big, clunky saddle bags......However, there are a few items that every a avid cyclist should carry. Tube, inflato, co2, lever, etc. This bag is made well, looks good on the bike, and simply works.....

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    Reviewed 9/28/2021
    by Anonymous
    Cycling Enthusiast
    Western North Carolina
    Overall Rating
    Great bag for the minimalist

    Light, waterproof and almost invisible under the saddle. Holds one tube, two CO2 cartridges, two tire irons, CO2 pump head and a small wrench. All that is needed for most rides. It sure beats most other larger, heaver bags.

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    Reviewed 9/29/2020
    by Anonymous
    Cycling Enthusiast
    Overall Rating
    Works great for a smaller bike

    Love the compact size. allows enough room for my radar

    Was this review useful to you? Yes/No
    Thank you for your feedback.

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