Castelli Race Bags Undersaddle XL


The second and larger of our two seat packs in the Castelli race bag collection (images are not to scale) the Undersaddle XL is designed to carry a couple of of road tubes... Read more...

View our delivery information
SKU: CS8900105


The second and larger of our two seat packs in the Castelli race bag collection (images are not to scale) the Undersaddle XL is designed to carry a couple of of road tubes a multi tool and a C02 system (plus a external sleeve for a mini  pump) with a little room to spare - Bt If your running trendy bigger tyres and hence bigger tubes you may need to select this over the mini to allow you two spares.

Held on my moulded magic Velcro (with a seat post stabiliser ) the bags simplicity is also its biggest asset. Water resistant fabric water resistant zips internal mesh pocket and well that's it. Just high quality minimalism.

Please note if you ride in heavy rain with no mudguards water will eventually get in to the bag so put everything in a plastic bag just in case.


Key features

  • Water and stain resistant materials
  • Water resistant zipper
  • Water resistant construction
  • Adjustable hook and loop attachment straps
  • External mini pump sleeve
  • Internal storage pocket
  • Reflective accents
  • External Dimensions 6 x 6 x15cm

Please note this is water resistant not waterproof. We recommend the use of a ziplock bag for anything you don't want to get wet.

ABOUT Castelli

Castelli Cycling is the most innovative, stylish and prestigious cycling clothier in the world. Decades of pro cycling development and a passion for perfection in materials, cut and performance has seen the brand reinvent cycle wear time after time. From the first Lycra shorts to sublimated printing, the game-changing Gabba and aerodynamic apparel, Castelli continues to set a path that others can only follow while maintaining generations of Italian heritage.


Founded by real cycling enthusiasts in 2004, our passion for elite performance runs through everything we do at Saddleback. Our team of dedicated roadies, mountain bikers and triathletes practice what we preach to bring you the finest cycling products and a superior service to match. We're the official UK home of 3T, Alchemy, Castelli, Chris King, ENVE, Sidi, Silca, Stages and Troy Lee Designs.


We use a third-party reviews system, Yotpo, which allows you to leave a review for products you’ve purchased from us. You will find the reviews form under the ‘Reviews’ tab on each product page.

Personal data collected:

  • Name
  • Email address

Where this data is stored:

This data is stored securely in an encrypted third-party service provided by our reviews system, Yotpo.

What we use this data for:

This data is used to verify your purchase of the product you’re reviewing and to publish the review on our website. The name under which the review appears can be anonymised at your discretion. The review itself may also be used for marketing purposes.

How long we keep this data:

This data will be kept as long as the review is visible on the website.

How to opt-out:

If you wish us to remove your data from our systems, please contact and we will be happy to help.

Read our full privacy policy.