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Your cart is empty.When you find your saddle bag zipper is straining to shut on nearly every ride it might be time to invest in a bigger bag. Castelli's Undersaddle XL Bag will hold all of your essentials — plus the extras you can't leave home without — but won't add undue bulk to your frame. Made with water and stain-resistant materials and a water-resistant zipper, the bag has Castelli's expected combination of sleekness and style. The bag's storage features are rounded off with an internal storage pocket and external mini-pump sleeve. It attaches to your frame quickly and securely with a hook-and-loop strap, and even has reflective accents to help keep you visible to motorists, day or night.
David
Reviewed in Spain on April 21, 2025
Muy buen material.Grande, caben muchas cosas.Queda genial.Muy fácil de colocar
Luis
Reviewed in Spain on May 29, 2024
La CASTELLI Undersaddle XL Bolsa de Deporte es un producto excepcional. Su tamaño XL permite llevar todo lo necesario para una sesión de deporte, y su diseño elegante en negro combina perfectamente con cualquier equipo. La bolsa es resistente y duradera, ideal para uso frecuente. Además, es muy cómoda de llevar gracias a sus correas ajustables. ¡Definitivamente, una compra recomendable para cualquier hombre activo!
Customer
Reviewed in the United States on July 13, 2023
Great product, very durable.Fits 1 tire tube, 2 co2 cans, 2 tire levers, co2 inflator
giorggi
Reviewed in Italy on April 12, 2023
Come tutti i prodotti di Castelli è di ottima qualità. Ottimi materiali, design minimalista, spazio sufficiente per due camere d'aria, due levacopertone, spiccioli e una piccola pompa (da infilare in due elastici sotto la borsa).
T. Begley
Reviewed in the United States on June 16, 2021
I have multiple Castelli clothes and they are top notch. When I saw this saddle bag with a longer profile to be able to fit 2 tubes and having a mini pump holder, I thought I had found the perfect product. I was stunned to see how bad this bag was. Really surprised and very, very disappointed. The material is very cheap, thin and would not hold up more than a couple of months. The zipper was very poor. I had to hold the bag and wrestle with it in order to get it to close. I returned it pronto.
Jonathan R.
Reviewed in Canada on January 20, 2021
The adhesive holding the strap together didn't last more than a season. It fell apart while I was descending and went flying at oncoming traffic.The shop I bought it from said it happened to someone else. Too bad, it was great while it lasted.
Keith
Reviewed in the United States on August 31, 2020
They call this an XL Cycling Saddle Bag but it's not really that big. However, it is big enough to hold my multi-tool, spare inter-tube (could probably fit two), a couple leavers, and a small pump so it works for me.
MNDC
Reviewed in the United States on July 16, 2020
I read the other reviews and was not expecting a big bag. It is high quality and looks nice. It is easy to remove if I want to lock my bike up. I keep a multi-tool, a patch kit, two tire tools and a couple of CO2 cartridges in it. With hose items it is full! No way you are going to put tools and a spare inner tube in it. Your phone or wallet? Forget it. So if you want a nice small bag to hold the basics, this is it. Otherwise look elsewhere.
Shawn Marks
Reviewed in the United States on March 31, 2020
Fits quite a bit. Would fit an emergency THIN vest if needed. (Only)I have tube, CO2 pump with extra cartridge, tire levers, multi tool, money clip. Slight room to spare. Won't fit modern smart phone, but if it were any bigger it would be a handlebar bag 😂
Henry D
Reviewed in the United States on December 15, 2020
I got the XL version knowing from other reviews that this was still a small bag. Some people however do indicate you can fit enough things in there for what I needed. Unfortunately that turned out to be inaccurate, I could not fit all my stuff, which was:2 x 23mm tubes - with 1 tube it all would likely fit1 x multitool2 x levers1 x mini chain tool2 x co2 cartridges with inflatorThis bag does look quite nice material wise, and being real small really does not obstruct from the bike's appearance. But for me that was also its downfall. Too little to be very useful. It's fine if say you used single tube rather than 2, but I wanted to use this for longer rides, like over 4-5 hours so using single tube wasn't comforting enough for me. I bought Topeak Wedgepack in Medium size which is much better for what I needed.
LTD
Reviewed in the United States on March 12, 2018
Had a micro bag for my skinny-wheel road bikes. Found it handled a tube, patches, multi-tool, and levers without a lot of wasted space, and could grab the saddle nicely. And then I got a new ride with 28s. Maybe up to 32s eventually. Squeezing that bigger spare tube into my trusty old micro bag was just too much, so, time to shop. Saw this reviewed somewhere, then found it here at Amazon. Sadly, unable to find the Castelli Undersaddle in the shops I checked, so, there I am, reading online reviews and mining for specs on this thing. First off: don't let the "XL" label fool you. This is any other company's mini. And that's good. Wasn't sure I liked the 'boxy' design, but then noticed the pump sleeve on the bottom, and that was it. Ordered. Fits my larger tube and all the other stuff with a little space to spare, while holding on tight and not looking huge. And offers what I consider the nicest mini-pump option. Kudos to Castelli for thinking outside the box on this one.
carlos chevez
Reviewed in the United States on December 12, 2017
Love this bag, it fits 2 tubes, 2 co2's, levers and a multitool in a very small bag. I thought it would be too small when I received it and was surpised at how much it fits without being overstuffed. It looks AMAZING too, i don't like the wedge shaped ones. Love it. Great bag, awesome Castelli quality, like always.;
Terry
Reviewed in the United Kingdom on June 3, 2016
Good quality but I think if it was just a centimetre or two longer and centimetre wider it would be perfect,it has strength and looks nice,it has a mesh compartment on the outside which is stretchy and I use it for my mini pump but in my opinion an additional strap for this mesh which is open ended at both ends would make it safer because if you store something in it you could find it working loose,the straps that tie the actual bag to the bike do not really prove useful in securing whatever is in the outer mesh compartment.
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