Topeak MTX TrunkBag Rear Bicycle Bag - Spacious Commuter Storage

In this review of the Topeak MTX TrunkBag, the bottom line is clear: this is a practical rear bag for cyclists who need organized, reliable carrying space for commuting and day trips. Reviewers consistently praise its roomy divided main compartment and the tool-free QuickTrack mount that makes removal after rides effortless. Built from 600D polyester with rigid EVA foam panels and a water-repellent finish, the bag balances durability with everyday convenience and a visible safety strip for low-light riding.

Key Features

• 12.3 L divided main compartment: Provides structured, organized storage so tools, a jacket, and essentials stay separated and easy to access during stops.
• Two zippered side pockets: Offer quick access to small items and can comfortably hold items like a slim laptop sleeve or compact board game box for day trips.
• QuickTrack System compatible: Mounts securely to Topeak MTX racks for a stable, tool-free connection and effortless slide-off removal after each ride.
• Durable water-repellent build: 600D polyester combined with rigid EVA foam panels maintains shape and resists dirt and abrasion for longer use.
• Convenient transport features: Includes a rear bottle holder, elastic bungees, a shoulder strap, and a carrying handle so the bag works on and off the bike.
• Enhanced night safety: A 3M reflective strip and rear light clip increase visibility for low-light commutes.

Who It's For

The Topeak MTX TrunkBag is aimed at commuters, day-trippers, and practical cyclists who need a stable, easy-to-remove rack bag with organized storage. Its 12.3 L capacity and divided layout make it well suited to carrying work essentials, a change of clothes, tools, and small recreational items without losing structure.

Cyclists who use non-MTX racks or need a waterproof expedition bag should look elsewhere; this bag is water-repellent but not fully waterproof, and the QuickTrack mount is designed for Topeak MTX-compatible racks for best stability.

Pros & Cons

Pros

• Quality construction with 600D polyester and rigid panels keeps the bag looking and performing well.
• Roomy, divided main compartment and side pockets make organization simple for commuting or errands.
• QuickTrack mounting system makes removal and reattachment fast and tool-free.
• Safety features like a 3M reflective strip and rear light clip boost visibility after dark.

Cons

• Not fully waterproof-resists water and dirt but heavy rain may require an extra cover for sensitive items.
• Best fit with Topeak MTX racks, so users with other rack systems may need adapters or a different bag.

Specifications

Our Verdict

The Topeak MTX TrunkBag is a smart value for riders who want a structured, easy-to-remove rear bag for commuting and day rides. Its organized 12.3 L layout, durable materials, and QuickTrack mounting make it a dependable daily carrier, though riders needing full waterproofing or a non-MTX fit should consider alternatives.

Frequently Asked Questions

Is this bag fully waterproof?
The bag is water-repellent thanks to 600D polyester and treated panels, but it is not fully waterproof; use a rain cover for heavy downpours.

Will it fit on any rear rack?
It mounts best on Topeak MTX-compatible racks using the QuickTrack System; other racks may require adapters or different mounting solutions.

Can it carry a laptop or board game box?
The side pockets and divided main compartment are roomy enough for slim laptops and standard board game boxes on day trips, as reported by customers.