10 Best Bike Trunk Bag 2025 in the United States

The Topeak MTX Trunk Bag DXP is a well-designed bike trunk bag that caters to cyclists looking for a reliable and spacious storage solution. With a generous capacity of 22.6 liters, it allows for the storage of various items, making it ideal for longer rides or commuting. The bag features an expandable top section and side panniers, adding to its versatility. This flexibility means you can adjust the storage space according to your needs, which is a significant strength for those who may carry different loads depending on the day.

Durability is another highlight of this product. Constructed from 600 denier polyester and insulated with molded EVA foam, it promises weather resistance, ensuring that your belongings stay safe from the elements. The multiple compartments, including a divided main compartment, help with organization, allowing you to access items quickly without rummaging through everything.

One of the standout features is its compatibility with QuickTrack systems, making installation a breeze on MTX racks with attachable side frames. This ease of mounting can be a game-changer for users who value convenience. The bag does weigh about 1160 grams (2.53 lbs), which might be a consideration for those looking to keep their bike setup lightweight. Additionally, while the reflective elements enhance visibility during night rides, some users might prefer even more pronounced safety features. The Topeak MTX Trunk Bag DXP is a robust choice for cyclists needing ample storage and durability. While it might feel a bit heavy for some, its capacity, weather resistance, and ease of use make it a solid companion for biking adventures or everyday commutes.

The JXFUKAL bike trunk bag offers a solid 17-liter capacity, making it roomy enough for daily commuting or weekend rides. It includes a main compartment plus extra side bags and multiple inner mesh pockets, helping keep your gear well-organized. Made from durable EVA with a waterproof PU coating, its hard shell design protects your items from rain and bumps, and it even comes with a rain cover for added weather protection. The bag is pretty lightweight at just under 3 pounds, so it won’t weigh down your bike too much.

Mounting is straightforward with four adjustable Velcro straps that fit most rear racks, whether on mountain bikes, e-bikes, or hybrids. This ensures a secure hold during rides. Reflective elements on all sides boost visibility at night, which is a nice safety touch, and there’s a strap for attaching a taillight (sold separately).

The bag also includes a shoulder strap and handle, making it easy to carry off the bike when needed. While the hard shell keeps the shape intact, the bag is slightly bulky compared to softer panniers, which might be a consideration if you’re looking for something more compact. Some users might find the rain cover a bit fiddly to use quickly. This bag is a practical choice for riders who want a weather-resistant, well-organized, and visible storage option on their bike's rear rack. It’s especially suited for commuters and casual cyclists who carry various essentials and value easy installation and carrying options.

The ROCKBROS Bike Rack Bag offers a spacious and versatile storage solution for cyclists. With a 34-liter capacity that can be expanded further using zippers, this bag provides ample space for your essentials. Made from carbon composite leather, it is durable and water-resistant, ensuring your belongings stay dry even in wet conditions. The bag also features a padded interior, which helps reduce shock and protect your items while riding. The integrated body frame adds to its durability, preventing it from deforming during use. The detachable partition allows for customizable storage, making it suitable for different needs, whether it's carrying clothes, shoes, or electronics.

Mounting the bag is straightforward with its Velcro system, making it easy to attach and remove from your bike's rear rack. The bag also comes with two shoulder straps, allowing you to convert it into a messenger bag for convenience off the bike. However, the bag does lack built-in reflective elements, which could be a safety consideration for night riders. Additionally, while the bag is lightweight at 6.7 ounces, some may find the foldable design less rigid than hard-shell alternatives.

The five compartments provide organized space. The ROCKBROS Bike Rack Bag is best suited for recreational cyclists and commuters who need a reliable, expandable, and multi-functional storage solution that can withstand various weather conditions. Despite minor drawbacks, it offers a good balance of capacity, versatility, and durability.