Shop the Podium—A Collection of Our Favorite In-Stock Products
This carousel displays a list of buttons that updates the main product image when a button is clicked
  • Options

CastelliUndersaddle Mini Bag


Item # CST00AH

Select options
  • Cancel
  • Select options
  • Black, One Size ($24.99)
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

Item # CST00AH

Undersaddle Mini Bag

You probably won't notice Castelli's Undersaddle Mini most of the time, but at some point, what you put inside of it will probably be the difference between you calling your spouse to come pick you up on the side of the road or just changing your tube and getting on with your ride. It's called the Mini Bag for a reason, so pack your ride essentials and leave the unnecessary stuff at home. Noticing the bag under your saddle wouldn't be such a bad thing either — it's made out of sleek, water-resistant material with Castelli's signature clean lines and classic style, and it's even sealed with a water-resistant zipper to keep your stuff safe during a shower.  Reflective accents help keep you visible to motorists any time of the day, and the bag attaches cleanly and securely to your saddle with a hook-and-loop strap.

  • Compact, weather-resistant bag built for under saddle storage
  • Water- and stain-resistant materials with a water-resistant zipper
  • Hook-and-loop attachment straps adjust to fit any bicycle
  • Internal storage pocket sized for valuables
  • Reflective accents assist with low-light visibility

Tech Specs
1 main
water resistant zipper
5 x 13 X 5 cm
Recommended Use
Manufacturer Warranty
30 days

View more Seat Bags

    What do you think about this product?


    >Rating: 5

    Perfect Saddle Bag

    I've put it through the wringer
    True to size

    This bag is perfect and fits the bare essentials perfectly! You can barely see it under the saddle, I would highly suggest.

    >Rating: 5

    Forget all reviews that aren't 5 star

    I've put it through the wringer
    True to size
    185 lbs

    If someone is saying this is too small, then they're a recreational cyclist. I'm a racer: all you need is a tube, lever, co2 and co2 adapter. Plenty of room in this little bad boy for all of that! And well constructed, easy and secure to mount. Just buy it.

    >Rating: 2

    Too Small to be useful

    I returned this product before using it

    It is a nicely made bag but is lacking in size to be truly useful. The capacity is 1 tube and maybe 1 Co2 or a small multi-tool. If that is all you need then maybe its ok. The zipper design is awkward and makes insertion and retrieval of a tube difficult. The pump pocket is useless except for the smallest of mini pumps. Don't even try to insert a Silca Pocket Impero. It wont fit.

    >Rating: 5

    Minimalist perfect bag

    Fits all the essentials: tube, multitool, and levers

    >Rating: 5

    Basic; well-made; all you really need.

    I've put it through the wringer

    I've mostly used the smallest-sized Arundel bags, favoring their simplicity (no seat post attachment, minimal size, styling, and thoughtful add-ons like the leather patch that mitigates wear on main contact point). But they're not waterproof, the straps fray prematurely, and the fabric zipper loops tend to fall off. This bag's attachment operates on the same principal: just a strap that loops through the saddle rails and around the bottom of the bag, where it is then affixed securely with Velcro. It is slightly larger then the Arundel--although a spare road tube, CO2 cartridge/inflator head, and lever is still a pretty tight fit. It is far more water resistant--even waterproof. It seems more durable and well-made overall, too, although time will tell. The only drawback is that the straps are quite stiff, making them a tad more challenging to thread through the rails. No big deal at all.

    >Rating: 5

    Great Minimalist Seatpack

    I've used it several times

    Really Nice seat bag if you are going for a minimalist approach. Enough for 2 c02's lever, inflator, tube and multi tool. The pack uses waterproof material and is constructed with the quality you would expect from castelli.

    >Rating: 5

    best in class

    I've put it through the wringer

    just the right size for CO2, tube, patches, small tool and a lever. seems water tight and looks good as well. other bags i've had are too big (fizik) or just bad (rapha).

    >Rating: 5

    Great little bag

    I've used it once or twice and have initial impressions

    Seems like a very durable material, includes a nice thick velcro strap that allows me to really snug the bag up against my seat and it's a perfect size that easily fits: a tube w/80mm valve, 2 CO2 cartridges, small CO2 inflator, multi-tool, tire lever and a small amount of room for a few bucks. This is replacing an Arundel Uno that I found to be of poor quality in terms of both material and closure strength.

    >Rating: 5

    good for its size

    I've put it through the wringer

    won't fit a pump but will fit enough patches, co2s, or tubes. solid little guy

    >Rating: 4

    Great looking and compact

    Fit a tube, multitool patch kit and levers. Will need a CO2 or keep packing the pump in my jersey