Castelli Undersaddle XL Saddle Bag
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Castelli Undersaddle XL Saddle BagCastelli Undersaddle XL Saddle Bag
Code: CS89001
Castelli Undersaddle XL Saddle Bag


The Castelli Undersaddle XL is a practical, stylish, user-friendly saddle bag that’s designed to cope with unpleasant wet weather conditions featuring a covered zip and simple, easily adjustable Velcro straps to hold it firmly in place. There’s plenty of room to store multitools, CO2 cartridges, spare tubes and puncture repair kit while a mesh underside allows you to store additional items externally.



  • Water resistant construction
  • Covered zip
  • Adjustable Velcro loops
  • External mesh pocket
  • Internal pocket
  • Reflective detailing
  • Size: 6x15x6cm

Sizing Information for Castelli Clothing:

Castelli Size Charts

MartinLooks nice and compact, stores a spare 25mm tube, multi tool, levers, patches, CO2 canister and more. External sleeve for mini pump is a really good feature
Mr CaseyFantastic saddle bag. Well made and enough room for spare tube and some small tools. Almost completely waterproof
Mike WBrilliant bag tried loads with poor velcro and straps to short but this bag is ideal. It takes 2 inner tubes, tyre levers and multi tool. It fits neatly under the saddle and is very secure. Very happy
GoranSuper for tabular tyres...
RobertNot as oversized as it looks in the pictures. Still holds a patch kit and levers, spare tube, inflator & extra cartridge, spare change, and has an elasticised external sleeve that will hold a mini-pump. Also has a drysuit style zipper, so it may be waterproof.
JessGreat product. Perfect size and doesn't move around at all when cycling.
Mr BorgesSo far so good! Good and valuable saddle bag for the price. I bought the XL size as I wanted to use this for road and mountainbike. I can put 2 road inner tubes+co2 cartridge and valve+multitool keys all safe and clean! It's good for wet rides and it has a nice touch and finish!
Mr HowardA great bit of kit to hold those bits and pieces if you have a puncture and at a great price
BrianBought as a spare summer saddle bag as I use a tool tube in winter. Despite the XL moniker this bag is not very big and would struggle to get more than 1 tube, levers, repair kit and multi tool in it. I'd rather have space for 2 tubes as I have double punctured on more than one occasion in the past. It is pretty discrete though and does have a sleeve to hold a co2 or mini pump on the underside. Good price on Merlin but loses a star for its lack of capacity.