ROCKBROS Bike Trunk Bag 17L-45L Bike Rear Rack Bag Bike Bags for Bicycles Rear Rack Waterproof Bike Rack Bag Review

The ROCKBROS Bike Trunk Bag is a must-have accessory for any cyclist looking to enhance their storage capabilities while on the go. With a capacity ranging from 17L to 45L, this rear rack bag offers ample space for all your cycling essentials, making it the perfect solution for long-distance rides or daily commutes. Its waterproof construction ensures that your gear stays dry and protected in all weather conditions, giving you peace of mind no matter where your journey takes you.

Say goodbye to cumbersome backpacks and uncomfortable saddlebags – the ROCKBROS Bike Trunk Bag provides a convenient and secure way to carry your belongings while on the road. Its easy installation onto your bike’s rear rack means you can quickly attach and detach the bag as needed, giving you the flexibility to switch between biking and walking without any hassle. Whether you’re carrying groceries, clothing, or tools, this versatile bag has you covered with its multiple compartments and adjustable straps for a custom fit. Upgrade your cycling experience today with the ROCKBROS Bike Trunk Bag and enjoy a more organized and efficient ride every time.


The ROCKBROS Bike Trunk Bag 17L-45L is designed to provide cyclists with a convenient and secure way to carry their belongings while on the road. With a capacity of 17-45 liters, this bike rear rack bag offers plenty of space to store essentials such as clothing, food, tools, and more. It features multiple compartments and pockets for easy organization, as well as reflective details for added visibility in low light conditions. The bag is also waterproof, ensuring that your items stay dry even in rainy weather.


This bike trunk bag is ideal for commuters, tourers, and bikepacking enthusiasts who need a reliable storage solution for long rides. It attaches easily to most rear racks and can be quickly removed when not in use. Whether you’re cycling to work, running errands, or embarking on a multi-day adventure, the ROCKBROS Bike Trunk Bag 17L-45L has you covered.


The ROCKBROS Bike Trunk Bag 17L-45L is constructed from durable and water-resistant materials, making it well-suited for outdoor use. It features a sleek and aerodynamic design that minimizes wind resistance and enhances the overall look of your bike. The bag is equipped with adjustable straps and buckles for a secure fit, as well as a built-in handle for easy carrying off the bike.

Build Quality

ROCKBROS is known for producing high-quality cycling gear, and the Bike Trunk Bag 17L-45L is no exception. The bag is well-made, with reinforced stitching and sturdy zippers that can withstand regular use and rough terrain. Its robust construction ensures that your belongings stay safe and secure throughout your ride, even on bumpy roads or trails.

Primary Features

Some of the standout features of the ROCKBROS Bike Trunk Bag 17L-45L include its adjustable capacity, reflective accents, waterproof design, and easy installation. Additionally, the bag comes with a detachable shoulder strap for convenient off-bike use, as well as a mesh side pocket for quick access to small items. Whether you’re a daily commuter or a weekend warrior, this bike rear rack bag is a versatile and practical accessory for any cyclist.

ROCKBROS Bike Trunk Bag Analysis

Pros of ROCKBROS Bike Trunk Bag

1. Waterproof material protects belongings from rain and water damage.
2. Spacious capacity ranging from 17L to 45L allows for storage of various items.
3. Easy installation and removal with adjustable straps make it convenient for users.
4. Reflective elements enhance visibility and safety during low-light conditions.

Cons of ROCKBROS Bike Trunk Bag

1. Limited color options may not cater to all aesthetic preferences.
2. Some users report that the bag may sag or bulge when fully loaded, affecting aerodynamics.
3. The closure system could be improved for better security of items while riding.
4. Price point may be higher compared to similar bike trunk bags on the market.

Key Features

The ROCKBROS Bike Trunk Bag is available in sizes ranging from 17L to 45L, making it suitable for various needs. The bag is designed to be mounted on the rear rack of your bicycle, providing convenient storage space for your belongings. It is made of waterproof materials to keep your items safe and dry during your ride. The bag also features reflective strips for added visibility in low light conditions.

Capacity and Size

When selecting a bike trunk bag, it is essential to consider the capacity and size that will best suit your needs. The ROCKBROS Bike Trunk Bag comes in different sizes to accommodate varying amounts of gear, from a compact 17L option to a spacious 45L version. Determine how much storage space you require for your daily essentials or longer trips before making a purchase.

Material and Durability

Another crucial factor to consider when choosing a bike trunk bag is the material and durability of the product. The ROCKBROS Bike Trunk Bag is crafted from waterproof materials to protect your belongings from rain and splashes. Additionally, the bag is designed to withstand the wear and tear of regular use, ensuring long-lasting performance for your cycling adventures.

Mounting System

Check the mounting system of the bike trunk bag to ensure it is compatible with your bicycle’s rear rack. The ROCKBROS Bike Trunk Bag features a secure attachment mechanism that allows for easy installation and removal. Make sure to follow the manufacturer’s guidelines for proper mounting to prevent any accidents or damage to your gear.

Organizational Features

Consider the organizational features of the bike trunk bag, such as compartments, pockets, and dividers, to help keep your items organized and easily accessible. The ROCKBROS Bike Trunk Bag offers multiple compartments and pockets for storing your essentials, such as water bottles, snacks, tools, and more. Stay organized on the go with a bike trunk bag that meets your storage needs.

Additional Considerations

Before making a purchase, consider additional factors such as price, brand reputation, and customer reviews. Compare different bike trunk bags in terms of features, quality, and value to make an informed decision. Look for a reputable brand like ROCKBROS known for producing high-quality cycling accessories that meet the needs of cyclists.


When shopping for a bike trunk bag, it is essential to consider key factors such as capacity, size, material, durability, mounting system, organizational features, and additional considerations. The ROCKBROS Bike Trunk Bag offers a range of options to suit your storage needs, with waterproof materials, secure mounting, and ample storage space. Make an informed purchase decision by evaluating similar products, reading reviews, and choosing a reputable brand like ROCKBROS for your cycling adventures.

Related Amazon Products

Finding the Right ROCKBROS Bike Trunk Bag on Amazon

1. Start by going to the Amazon website and searching for “ROCKBROS Bike Trunk Bag”. This will bring up a list of available options for you to choose from.

2. Narrow down your search by filtering the results based on the size you are looking for, whether it be 17L, 25L, 37L, or 45L capacity. Consider how much storage space you need for your belongings.

3. Read the product descriptions and customer reviews for each bag to get an idea of the quality and features. Look for bags that are waterproof, durable, and have convenient compartments for organization.

4. Pay attention to the material and construction of the bag. Make sure it is made of high-quality materials that can withstand the elements and protect your belongings while riding.

5. Check the compatibility of the bag with your bike’s rear rack. Some bags are designed to fit specific racks, so make sure the one you choose will work with your bike.

6. Consider the design and style of the bag. Choose one that not only meets your practical needs but also matches your personal preferences and aesthetic.

7. Once you have found the right ROCKBROS Bike Trunk Bag for you, proceed to add it to your cart and complete the purchase on Amazon’s website.

Common Issues with ROCKBROS Bike Trunk Bag

1. Waterproofing: Some users have reported issues with the waterproofing of the bag, experiencing leaks during heavy rain. To address this, you can apply additional waterproofing solutions or choose a bag with better waterproofing features.

2. Installation: Installing the bag onto the rear rack can be tricky for some users. Make sure to carefully follow the instructions provided or seek help from a professional if needed.

3. Durability: There have been complaints about the durability of some ROCKBROS Bike Trunk Bags, with seams coming apart or zippers breaking. Be sure to choose a bag with strong construction and quality materials to avoid these issues.

Frequently Asked Questions

Is this bike trunk bag waterproof?

Yes, the ROCKBROS Bike Trunk Bag is waterproof, making it suitable for all weather conditions.

What is the capacity of this bike trunk bag?

The capacity of the bag is adjustable and can range from 17L to 45L, providing ample space for your belongings.

Can this bag be attached to any bike rear rack?

Yes, this bag is designed to be easily attached to most bike rear racks, providing a secure fit for your ride.

Are there reflective elements on this bike trunk bag for visibility?

Yes, this bag features reflective elements for increased visibility and safety while riding in low light conditions.

Is there a warranty included with this product?

Yes, ROCKBROS offers a warranty for their products, ensuring customer satisfaction and quality assurance.

In conclusion, the ROCKBROS Bike Trunk Bag is a must-have accessory for any cyclist looking for a reliable and durable storage solution. With its spacious capacity ranging from 17L to 45L, waterproof construction, and easy installation on bike rear racks, this bag offers convenience and peace of mind during outdoor adventures. Its multiple compartments and reflective strips enhance both functionality and safety while on the road. Overall, the ROCKBROS Bike Trunk Bag is a valuable choice for cyclists of all levels, providing ample storage space and protection for your belongings during your rides.

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