Saddle Trunk Bag TOPEAK MTS TrunkBag DXP — rear rack-mounted storage, expandable pannier-compatible

TOPEAK MTS TrunkBag DXP is a rear rack-mounted trunk bag designed to expand cargo capacity on bicycles equipped with compatible racks. The bag attaches using TOPEAK's MTS mounting system and provides a main compartment with organized pockets plus expandable pannier-style side sections that increase volume when needed. Constructed for daily use, it keeps tools, clothing and personal items accessible on the rear carrier while preserving compatibility with pannier racks and other rear accessories.

Advantages

The trunk bag offers modular storage that converts from a compact top trunk to an expanded pannier configuration, allowing flexible load management for different rides. Durable materials and reinforced attachment hardware provide secure mounting to the rear rack, while multiple compartments and pockets enable organized placement of smaller items without cluttering the main space.

Suitable for

• Daily commuting and work trips where rear cargo capacity is required
• Urban shopping and errands that need extra storage
• Touring and multi-day rides that require expandable luggage
• Transporting tools, rain gear and spare clothing on the rear carrier

Key specifications

• Mounting: rear rack attachment using TOPEAK MTS mounting system
• Configuration: top trunk with expandable pannier-side compartments
• Compartments: main compartment with internal pockets for organization
• Materials: durable water-resistant fabric with reinforced panels for rack contact
• Access: zipper closures for main and side compartments; quick-release attachment hardware

How to use

Mount the TrunkBag DXP onto a compatible rear rack using the MTS quick-release interface, ensuring attachment points engage securely. Use the main compartment for frequently accessed items and the internal pockets for tools or small accessories. When additional capacity is required, deploy the pannier-side sections to increase storage volume and secure zippers or fastenings. Check attachment points and zippers before each ride to confirm the bag is stable and closed.

Recommendations

For safe and balanced loading, place heavier items low and centered in the main compartment and distribute weight evenly between the pannier-side sections. Regularly inspect mounting hardware and contact surfaces for wear and keep the fabric clean and dry to prolong service life.