This large-capacity Topeak MTX Trunk Bag is a must - have for cyclists. It features a main compartment and two expandable pannier side panels, giving you extra storage space when needed. There's also a rear water bottle holder for easy hydration on the go. Thanks to Topeak's special construction, it's rigid and water - resistant. It's compatible with all MTX QuickTrack racks that have side frames. When using side panniers on MTX BeamRacks, MTX Dual Side Frames are required.

Using this Topeak MTX Trunk Bag is easy. First, make sure your rack is an MTX QuickTrack rack with side frames or use MTX Dual Side Frames on MTX BeamRacks if you're using side panniers. Then, securely attach the trunk bag to the rack. You can use the main compartment for larger items and expand the side panels when you have more to carry. Keep your water bottle in the rear holder for quick access. As for maintenance, wipe it down with a damp cloth after use to keep it clean. If it gets wet, let it dry thoroughly to maintain its water - repellence. Avoid overloading the bag to prevent damage to the expandable panels and the rack attachment.