Topeak MTX TrunkBag Rear Bicycle Bag - Spacious, Easy Mounting

Our review of the Topeak MTX TrunkBag finds it best suited for daily commuters and weekend riders who want organized, reliable storage without fuss. The single biggest reason to buy is its combination of a divided 12.3L main compartment and two zippered side pockets that keep a change of clothes, tools, and snacks neatly separated and easy to reach. Attachment is straightforward on Topeak MTX QuickTrack racks, so riders who value fast on-and-off convenience and a stable ride will appreciate this trunk bag.

Key Features

• 12.3L Organized Storage: The divided main compartment and two zippered side pockets let you separate a change of clothes, small tools, and snacks for quick access during a commute or day trip.
• QuickTrack Compatibility: Slides and locks onto Topeak MTX QuickTrack racks for secure mounting and tool-free removal when you need to take the bag off the bike.
• Durable, Water-Resistant Build: Constructed from 600 denier polyester with rigid EVA foam insulation to protect contents and keep the bag's shape while repelling light moisture.
• Versatile Carry Options: A detachable shoulder strap and carrying handle make it easy to use the bag off the bike, while the rear water bottle holder adds on-bike convenience.
• Enhanced Visibility: A 3M reflective strip improves nighttime visibility so you stay seen on low-light rides.

Who It's For

This trunk bag is ideal for urban commuters who want reliable day-to-day storage that stays put on a rack and detaches quickly for errands. It's also a good choice for weekend riders who need room for layers, a small tool kit, and snacks without a bulky pack on their back.

Riders who use non-Topeak racks or need a fully waterproof touring pannier should look elsewhere; this bag is optimized for MTX QuickTrack systems and water resistance rather than full submersion protection.

Pros & Cons

Pros

• Roomy 12.3L capacity with organized compartments that make packing and finding items easy.
• QuickTrack compatible mounting provides very easy installation and secure attachment on compatible racks.
• Sturdy 600 denier polyester and EVA foam keep the bag structured and protect contents during rides.
• Useful extras like a rear water bottle holder and detachable shoulder strap increase versatility off the bike.

Cons

• Not fully waterproof, so prolonged exposure to heavy rain may require a rain cover or additional protection.

Specifications

Brand	Topeak
Capacity	12.3L
Material	600 denier polyester with EVA foam
Mounting	Topeak MTX QuickTrack compatible
Storage	Divided main compartment plus two zippered side pockets
Visibility	3M reflective strip
Carry features	Detachable shoulder strap, carrying handle, rear water bottle holder

Our Verdict

The Topeak MTX TrunkBag is a practical, well-built accessory for commuters and casual riders who use MTX QuickTrack racks. It delivers thoughtful organization, sturdy construction, and easy on/off convenience at a sensible value, though riders who need full waterproofing should add extra protection.

Frequently Asked Questions

Will this bag fit any rear rack?
The bag is designed for Topeak MTX QuickTrack racks and locks to that system; it may not mount securely to non-MTX racks without adapters.

Is the bag waterproof?
It is water-resistant thanks to 600 denier polyester and EVA foam but not fully waterproof; use a rain cover in heavy downpours.

Can I carry it off the bike?
Yes, the detachable shoulder strap and carrying handle make it easy to use off the bike for errands or short walks.