Orders under $29.99 ship for $4.99, while orders of $29.99 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
This expandable bike rear rack bag combines waterproof protection, hard shell durability, and versatile storage in one smart design. With 17L–35L capacity, sealed zippers, and included rain cover, it’s built for commuting, touring, and all-weather cycling.
ROCKBROS
17L-35L
Black/Black-Green
Light rain resistant
Explore Boundlessly, Ride Passionately.
Enjoy Cycling, Enjoy ROCKBROS.
Let the rhythm of rolling wheels become the soundtrack of freedom and joy.
