Castelli Undersaddle XL Saddle Bag

Castelli Clothing

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The Castelli Undersaddle XL is the larger of the two Castelli saddle bags in the Italian brand's Race Bags collection. On off-season or longer length rides, extra saddle bag space can be welcome; the XL comfortably takes more than one spare tube, a multitool, tyre levers, Co2 canisters and inflators, patches, cable ties - the list goes on. An elasticised rear mesh mini pump sleeve works to further free up valuable space in jersey pockets.

The bag itself is made using tough, weatherproof material with a covered water-resistant zip to keep road spray and muck away from tools and tubes. Attachment straps at both the top and back of the saddlebag keep everything tightly in place as rough winter roads rattle you along.

Castelli Undersaddle XL Saddle Bag

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Product features
  • Water Resistant
  • Open Road
In Detail
  • Tough, weatherproof nylon construction
  • Two strap attachment for additional security
  • A perfect winter riding partner with additional space for multiple spares
  • Stylish, sleek and unassuming
  • Use a damp non-abrasive cloth to remove marks
  • Dry naturally
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Size help and product measurements
Castelli Undersaddle XL Saddle Bag
Size Chart
This is the brand’s general size chart, use this to get an idea of which size is right for you.
chest (inches) 36 38 39.5 41.5 43.5
waist (inches) 31.5 33 34.5 36.5 38.5
inseam (inches) 32 32.5 32.5 33 33.5
chest (inches) 31 33 35 37 39 41
waist (inches) 25 26.5 28.5 30.5 32.5 34.5
hips (inches) 34.5 36 38 40 42 44
palm size (cm) 24 24.8 25.4 26.6 26.4
For an accurate glove size, please measure across your flat open palm just below the fingers, then compare your measurement to the chart above. If it's a close call, go one size up or down depending on the result.
shoe size (Euro) 36-39 40-43 44-47
shoe size (Euro) 36-39 40-42 43-44 45-46 46-48

Where is my order sent from?

All orders are packed & shipped from our HQ in the UK on the same day you order, if in stock and ordered before 3pm GMT Monday to Friday.


We offer both mail and express ship options courtesy of Royal Mail and DHL respectively. Below you will find a rundown of default delivery costs, but to see your personalised shipping cost, please visit the delivery section of checkout when you have added some items to your bag. Please note that orders of bulky items will attract a surcharge.

 Royal Mail*Express*
UK Free, or £3 for Tracked 48 DPD Next Day (Mon-Fri), £5.00
N. AMERICA Up to 10 working days, from $8 2 day, from $10
EUROPE Up to 5 working days, from €5 Next day, from €8
SCANDINAVIA Up to 5 working days, from €5 Next day, from €10
AUSTRALIA / NZ Up to 10 working days, from $10 3 day, from $20
JAPAN Up to 10 working days, from ¥700 3 day, from ¥1400
REST OF WORLD Up to 14 working days, from $10 3 day, from £20

60 Day Returns

Returns are really simple. We include a returns address label inside every package, so if you would like to return something to us, just make sure to send it back up to 60 days after you have received it.

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