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Undersaddle Mini Bag

4 out of 5 stars
2 Reviews



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
  • Item #CST00AH
1 main
water resistant zipper
5 x 13 X 5 cm
Recommended Use
Manufacturer Warranty
30 days

Overall Rating

4 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 1 reviews
4 Stars - 0 reviews
5 Stars - 1 reviews

Fits True To Size

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Runs smallTrue to sizeRuns large

What do you think about this product?


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3 out of 5 stars

March 7, 2022

Doesn't hold up to wet conditions well

In terms of size and looks, this bag is great. While riding it doesn't sway at all and I've never had an issue with the bag falling off or coming loose mid-ride (after about 3k miles of riding with it). When riding in wet conditions however the contents of my bag also get wet (and rust). This wasn't the case with my Topeak bag which had thicker material. The zipper is also very clumsy and I have trouble closing it even when it's not very full. If you ride a lot in wet/snowy conditions, I wouldn't recommend.

Kristen M

Originally reviewed on

5 out of 5 stars

May 15, 2021

Perfect for the Essentials

I've used it several times

Yes, this is a small bag (it's called Mini), but it holds the necessities: tube, CO2, tire levers, mini tools. The bag fits snugly beneath the seat, with no swinging. Love it!

Mark M

Originally reviewed on