Castelli Undersaddle Bike Bag

Designed for riders who appreciate a clean race-bike aesthetic, the Castelli Undersaddle Saddle Bag range combines minimalist styling, lightweight construction and practical storage for everyday road riding. Available in multiple sizes including Mini, Medium and XL, the range caters to everything from race-day essentials through to longer endurance ride setups.

The compact low-profile design integrates neatly beneath the saddle while durable water and stain-resistant materials help protect contents during wet or unpredictable conditions. Depending on the size selected, the bags comfortably store spare tubes, CO2 cartridges, tyre levers, multitools, tubeless repair kits and ride nutrition without unnecessary bulk.

A secure hook-and-loop attachment system keeps the bag stable over rough roads, while selected models include an external stretch mesh sleeve for mini-pump storage. Cycling Weekly praised the Undersaddle XL for its sleek road-focused profile and efficient storage layout for essential repair gear.

Features

• Available in Mini, Medium and XL sizes
• Lightweight premium road saddle bag design
• Streamlined race-bike profile
• Water and stain-resistant materials
• Secure saddle rail and seatpost attachment
• Internal storage organisation
• Selected models feature external mini-pump sleeve
• Designed for road cycling essentials
• Stable fit during aggressive riding