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Castelli Undersaddle XL Saddle Bag Castelli Undersaddle XL Saddle Bag
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Undersaddle XL Saddle Bag

Mfg PartNum:8055688151874
  (6 customer reviews)
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Castelli's Undersaddle XL Saddle Bag features a covered zip to shield against rain and wheel-spray. It's big enough for multiple spare tubes, a multitool, tire levers, an inflator, CO2 canisters, some patches, and even a minipump in the elasticized underside mesh section.

Features & Specs:

  • Water- and stain resistant materials.
  • Water-resistant zipper.
  • Dimensions: 6 x 15 x 6cm.
  • Adjustable hook and loop attachment straps.
  • External mini pump sleeve.
  • 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.


Bag Type: Saddle 


Bag Capacity: 100 to 200 ci 


Mfg PartNum: 8055688151874 

Ordered by Most Relevant First
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Not a XL saddle bag
by Raffjet
Competitive Racer
Elk Grove Village, Illinois

Very compact which is nice but way to small. The air pump sleeve is a nice touch but the zipper is horrible. After one gravel ride which it got wet. The zipper doesn't operate normally. It's super hard to zip.

Reviewed 11/18/2022
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Castelli seat bag
by Anonymous
1 of 1 customers found this review helpful.

I like just about everything Castelli makes. This bag is no exception. Delivery was prompt too.

Reviewed 1/6/2022
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Only XL by Castelli standards, but very nice
by itsmel
Cycling Enthusiast
Virginia, USA
2 of 2 customers found this review helpful.

Seems well made, as I'd expect from Castelli. Had to laugh at the XL name, though. It is XL compared to other saddle bags in the same way that Castelli XL jerseys are XL compared to most other brands--in other words, not really XL at all.

Packed fairly tightly, i was able to include a road tube, two CO2 canisters with an inflator, two tire irons, a multi tool, and a cloth mask. The bag fits very snuggly under the seat and looks pretty good. For me its size strikes the right balance between what I want to carry and how big of a bag I want under my saddle. If I flat, though, I will have to unpack and then repack the entire thing in order to get the tube out.

Reviewed 9/3/2021
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Bigger than expected
by gmgriffin9
Cycling Enthusiast
Berkeley, CA

Nice design. Castelli panache. Too large for my needs though. Ordered the Castelli mini which is perfect for 2 tubes, 2 CO2 cartridges, and CO2 regulator head. This one can fit all that plus multi-tool and room to spare for ??? Levers, I guess, if you need them. Need to take off bag to access contents, so it's not handy to store goo or anything you will definitely need on the ride.

Reviewed 5/20/2022
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Perfect Saddle bag
by DHerr
Competitive Racer
2 of 2 customers found this review helpful.

I'm an ultra cyclist and often ride for 100 miles+ on a given day, so I have to carry "everything" with me. I've been on the hunt for a saddle bag that's small enough to tuck under my saddle but still hold all of my stuff including a minipump. This bag is perfect! I've tried 5-6 other bags and they are either too bulky, too small, not aero, won't hold my minipump.... But this bag checks all the boxes. HIghly recommend.

Reviewed 12/3/2021
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Very nice saddle bag
by Tom
Cycling Enthusiast
3 of 4 customers found this review helpful.

I like the size and especially the pump holder. Materials are very good.

Reviewed 6/21/2019
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