I replaced my camelback to get the weight off my shoulders with your dry bag, works great!
Orders under $50 ship for $5.99, while orders of $50 and above enjoy free shipping (3–5 business days). $10 extra applies for bulky items.
In-stock items ship from our U.S. warehouse in 3–5 business days; international orders take 7–12 business days when U.S. stock is unavailable.
We offer a 30-day hassle-free return and exchange policy starting from the date you receive your item. To be eligible, products must be unworn, unused, with tags attached, in original packaging, and accompanied by proof of purchase. If the item is defective, damaged, or incorrect, we cover the return shipping cost; for size or personal preference returns, the customer is responsible for shipping fees. Please inspect your order within 72 hours and contact us for any issues. Refunds will be processed within 10 business days after we receive and inspect your return. Please contact customer service before returning items and send returns to the designated address; unauthorized returns will not be accepted. For questions, email-contact@rockbrosus.com
Estimated Delivery Timeline
Tired of carrying a bulky backpack while cycling? The ROCKBROS 16L waterproof bike trunk bag keeps your lunch, clothes, gym gear, and daily essentials securely on your rear rack. Its quick-release design lets you easily take it off and carry it as a shoulder bag when you arrive.
Fits most bicycles equipped with a compatible rear rack.
100% Waterproof Protection
Made with TPU heat-welded construction, this bike rack bag provides reliable protection against rain and water without requiring a separate rain cover. Keep your essentials dry on daily commutes and wet-weather rides.
One Bag for the Whole Commute
Designed for daily commuting, this 16L bike trunk bag gives you practical space for your laptop, lunch, jacket, water bottle, cycling tools, and other essentials. Carry everything you need in one bag without the bulk of a traditional backpack.
Take It Off the Bike, Carry It Anywhere
More than a bike trunk bag, the detachable shoulder strap allows you to easily carry the bag after parking. Perfect for commuting, shopping, coffee runs, and everyday errands.
Six-Point Mounting for a Secure, Quick-Release Fit
Tired of a bike rack bag shifting or bouncing over rough roads? The six-point mounting system uses secure Velcro straps to keep the bag firmly attached to your rear rack while reducing unwanted movement. When you reach your destination, simply release the straps for quick, easy removal.
Semi-Structured Design for Everyday Commuting
Structure where you need it. Flexibility where you don't.
A reinforced bottom provides the support needed to keep the bag stable and upright on your rear rack, while the flexible construction makes it easy to pack, carry, and use off the bike. Perfect for everyday commuting and changing loads.
ROCKBROS
≈16L（After expansion）
Olive Green / Black
Learn more about fit, features, and everyday use to find the right bike bag for your rides.
Yes. This bike rack bag is designed for daily commuting, city rides, and short cycling trips. With a 16L storage capacity, it provides enough space for everyday essentials such as a jacket, lunch, water bottle, cycling tools, phone, and wallet — helping you ride comfortably without carrying a backpack.
This rear rack bag is compatible with most standard rear bike racks, including many commuter bikes, hybrid bikes, mountain bikes with rear racks, and e-bikes with compatible rear racks. Please check your rear rack size and available mounting space before purchase to ensure a proper fit.
The 16L capacity is ideal for everyday cycling needs. It can hold items such as a jacket, lunch box, water bottle, repair tools, cycling accessories, wallet, phone, keys, and other personal essentials.
Yes. This bike rack bag works well for grocery runs, coffee trips, shopping, and other daily errands. The convenient storage design allows you to carry small to medium-sized items while keeping your hands free during cycling.
Yes. The detachable shoulder strap allows you to easily remove the bag from your bike and carry it with you after parking. It is convenient for commuting to work, visiting coffee shops, shopping, or running everyday errands.
Yes. This fully waterproof bike rack bag is designed to keep your belongings protected during rainy rides and wet weather conditions. Its waterproof construction helps prevent water from entering the bag, making it a reliable choice for daily commuting, city cycling, and outdoor adventures.
Installation is quick and simple. Secure the bag to your rear rack using the adjustable mounting straps, adjust the fit, and tighten the straps for a stable attachment. No special tools are required for installation.
Installation is quick and simple. Secure the bag to your rear rack using the adjustable mounting straps, adjust the fit, and tighten the straps for a stable attachment. No special tools are required for installation.
Overall rating: 4.7 / 5 from 10 reviews.
I replaced my camelback to get the weight off my shoulders with your dry bag, works great!
A little smaller than I expected but build quality is insanely great
Bought this for the back of an Lectric XP Lite.. This is really a superior product! Quality material… super workmanship! Fits perfect. Highly recommend 👍
Perfect dor errands on my e bike
Easy to install
Great, other than the zipper pull that broke immediately, but I alread had some replacements on hand. It works great and keeps my gear safe behind me on my rides.
Love this bag. It’s exactly what I was looking for on my rear rack to compliment my panniers. It’s great for stashing things I need to get to quickly when hitting camp or stopping during the day’s ride. Attaches very securely and opens wide for easy access. Love it
Hadn’t used it yet as its for my bike trip thru netherlands in late september (i should be back at school)or steal my daddy’s cue and make livin outta playin pool, sorry distracted , how is the proper way to fold like shown in photo. Thanks ,
Perfect fit for my letrix xp 4 thank you!
Explore Boundlessly, Ride Passionately.
Enjoy Cycling, Enjoy ROCKBROS.
Let the rhythm of rolling wheels become the soundtrack of freedom and joy.