The CASTELLI Undersaddle XL saddlebag features a covered zip to avoid rain and wheel-spray from seeping in – especially if you want to use it during the winter.

It's big enough to house multiple spare tubes, multitool, tire levers, an inflator, CO2 canisters, some patches, and allow you to store a minipump in an elasticized mesh section on the underside of the saddlebag.

If you ride like the pros, you'll be able to fit a 23 tubular tire, multitool, a CO2 canister and mini pump into the bag.