--- product_id: 162751884 title: "ROCKBROS Bike Rack Bag 9-12L Expandable Trunk Bag with Rain Cover" brand: "rockbros" price: "€ 111.10" currency: EUR in_stock: true reviews_count: 13 category: "Rockbros" url: https://www.desertcart.hr/products/162751884-rockbros-bike-rack-bag-9-12l-expandable-trunk-bag-rain store_origin: HR region: Croatia --- # Reflective strips + taillight hook Expandable 9-12L capacity Waterproof rain cover included ROCKBROS Bike Rack Bag 9-12L Expandable Trunk Bag with Rain Cover **Brand:** rockbros **Price:** € 111.10 **Availability:** βœ… In Stock ## Summary > πŸš΄β€β™‚οΈ Elevate your commute with the ultimate all-weather, expandable bike bag! ## Quick Answers - **What is this?** ROCKBROS Bike Rack Bag 9-12L Expandable Trunk Bag with Rain Cover by rockbros - **How much does it cost?** € 111.10 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/162751884-rockbros-bike-rack-bag-9-12l-expandable-trunk-bag-rain) ## Best For - rockbros enthusiasts ## Why This Product - Trusted rockbros brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Secure & Stable Ride:** Thick foam padding and robust hook & loop straps ensure zero flapping or wobbling on your rear rack. - β€’ **Weatherproof Warrior:** Durable polyester fabric paired with a full rain cover keeps your gear dry no matter the forecast. - β€’ **Versatile Carry Options:** Easily switch from bike-mounted pannier to shoulder bag with the removable strap for seamless on-the-go transitions. - β€’ **Adaptive Storage Mastery:** Expandable side pockets and removable divider let you customize your 12L space for every commute or adventure. - β€’ **Nighttime Visibility Boost:** Integrated reflective strips and taillight hook maximize your safety during low-light rides, keeping you seen and secure. ## Overview The ROCKBROS Bike Rack Pannier Bag offers a versatile 9-12L expandable capacity with customizable compartments, crafted from durable polyester with waterproof rain cover. Designed for stability and wear resistance, it mounts securely on your bike’s rear rack with foam padding and adjustable straps. Multi-functional for commuting or leisure, it converts easily to a shoulder bag and features reflective safety strips plus a taillight hook for enhanced night visibility. ## Description Shop ROCKBROS Bike Rack Bag 9-12L Expandable Trunk Bag with Rain Cover | Fold-0ut Side Panniers, Reflective Strips, Rear Rack and Pannier Storage for Commuting, Touring and Bikepacking. Free delivery and returns on all eligible orders. Review: Finally, a cheaply priced bag but with VERY good build quality - It's very light weight, not bulky and is very solid and stable (no more saddle bag flapping around and hitting the wheel). It's detachable and easy to take off/put on due to the velcro. It has a strap (it's inside the bag itself when you buy it incase you feel like it's missing) Very customisable storage choices. You put it ontop of the rack like normal, the side pockets open and extend to become side bags for even more storage or keep them rolled up if you don't need it. A huge main storage section with an optional divider and about 20 other pockets. It's quite tall so it will block any rear lights on your seat post, but it has an area at the back of the bag where you can clip lights to. Honestly it's a 9/10. The only improvement I would make is for the velcro to be detachable, so that it can be left attached to the frame and I can take the bag straight off. Review: Very impressed! - I have just been in a 14 mile ride. This bag did not move at all. Fits perfect. Very versatile with the expanding side bags. Loads of room inside for essentials. Inside mine is a first aid kit., spare tubes, a mini pump, cloth, pack of tissues, substantial bike lock and gloves. Heaps of room for more! Love the bottle holder on the bag, this will be very useful when in longer summer rides and you need to carry more water. Yes the underside Velcro straps are a tad too long, but I’d rather that than too short. They are obviously long so they can be adapted. The front Velcro straps are a massive bonus , as you can ride along with confidence knowing the bag won’t slip back. I noticed not many pannier bags have this feature. The rain cover, what a bonus too! Highly recommend this bag. It also feels very robust! Update- one year on, this bag is till going strong! Zips perfect, seams still strong with no sign of getting loose. Been on loads of wet weather / muddy rides too! This bag has been well worth the purchase price. ## Features - βœ… EXPANDABLE SPACE: Inside the trunk bag, there is a removable board with that you could adjust the inner space. With the two side package expandable, the capacity of the seat bag is up to 12L that allows you to put more articles. - βœ… STABLE & WEAR RESISTANCE: Thanks to the thicken foam pad on the bottom and side of the rear seat bag, the stability comes to high level. And the quality polyester material offers great wear resistance. - βœ… MUTIPLE CARRY WAYS: With the hook and loop straps and buckles, you could fasten the luggage package to the bike rear seat easily. While you want to use the bag as a commuter bag, you attach the adjustable shoulder strap to the bag. - βœ… HUMANIZED DESIGN: Package with rain cover. The bottle pocket to put another more water during long cycling trip. The elastic rope on the top for fixing other accessories. - βœ… NIGHT SAFETY: The reflective strips on the side make your bike visible during night cycling. Besides, you could attach a taillight to the pothook on the back to remind the drivers of your bike. 【ATTENTION】If you have any problems about our products, pls feel free to contact us, we will try our best to help you. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07WYGVLWV | | Automotive Fit Type | Universal Fit | | Best Sellers Rank | 31,220 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 38 in Cycling Panniers & Rack Trunks | | Brand | ROCKBROS | | Brand Name | ROCKBROS | | Capacity | 12 litres | | Closure Type | Zipper | | Colour | Black | | Compatible with Vehicle Type | Bicycle | | Country Of Origin | China | | Customer Reviews | 4.5 out of 5 stars 1,569 Reviews | | Handle Type | removable with water bottle holder | | Item Dimensions L x W x H | 35.4L x 16.7W x 16.2H centimetres | | Item Weight | 566 Grams | | Manufacturer | ROCKBROS | | Manufacturer Part Number | A9-BK | | Material | Polyester | | Material Type | Polyester | | Model Number | A9-BK | | Mounting Type | Rack Mount, Seat Mount | | Number of Compartments | 3 | | Number of Items | 1 | | Pattern | Solid | | Pocket Description | Zippered Pocket | | Product dimensions | 35.4L x 16.7W x 16.2H centimetres | | Shell Type | Soft | | Size | One Size | | Strap Type | Removable | | Style Name | Sporty | | Vehicle service type | Bicycle | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** ROCKBROS - **Colour:** Black - **Material:** Polyester - **Size:** One Size - **Vehicle service type:** Bicycle ## Images ![ROCKBROS Bike Rack Bag 9-12L Expandable Trunk Bag with Rain Cover - Image 1](https://m.media-amazon.com/images/I/71CYEet73wL.jpg) ## Questions & Answers **Q: How long are the bottom straps and how do they secure? Are they long enough to go round an e-bike battery fitted underneath the carrier, or just the ?** A: Mmmm, they are only approx. 30cm long. I doubt it to be honest **Q: How much weight can it carry?** A: Difficult to say precisely. 5 Kilos or so I'd say. What is important I think is the distribution of weight. If it's all over to one side then the bag is liable to start leaning. It is semi-rigid, but there is a limit to how much it can take before it starts losing its shape. **Q: Can fit a full size helmet ?** A: Hi, thank you for contacting ROCKBROS, this bike pannier bag's dimension is 43.79 x 30.3 x 17.6 cm, i think it couldn't fit a full size helmet. You can have a look others bike pannier bag in our stores. Thank you. **Q: Could you fit a helmet inside?** A: Hi, it might be a little cramped for this pannier bag to put a helmet. Thanks. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Finally, a cheaply priced bag but with VERY good build quality *by A***R on 4 November 2023* It's very light weight, not bulky and is very solid and stable (no more saddle bag flapping around and hitting the wheel). It's detachable and easy to take off/put on due to the velcro. It has a strap (it's inside the bag itself when you buy it incase you feel like it's missing) Very customisable storage choices. You put it ontop of the rack like normal, the side pockets open and extend to become side bags for even more storage or keep them rolled up if you don't need it. A huge main storage section with an optional divider and about 20 other pockets. It's quite tall so it will block any rear lights on your seat post, but it has an area at the back of the bag where you can clip lights to. Honestly it's a 9/10. The only improvement I would make is for the velcro to be detachable, so that it can be left attached to the frame and I can take the bag straight off. ### ⭐⭐⭐⭐⭐ Very impressed! *by B***Z on 27 May 2023* I have just been in a 14 mile ride. This bag did not move at all. Fits perfect. Very versatile with the expanding side bags. Loads of room inside for essentials. Inside mine is a first aid kit., spare tubes, a mini pump, cloth, pack of tissues, substantial bike lock and gloves. Heaps of room for more! Love the bottle holder on the bag, this will be very useful when in longer summer rides and you need to carry more water. Yes the underside Velcro straps are a tad too long, but I’d rather that than too short. They are obviously long so they can be adapted. The front Velcro straps are a massive bonus , as you can ride along with confidence knowing the bag won’t slip back. I noticed not many pannier bags have this feature. The rain cover, what a bonus too! Highly recommend this bag. It also feels very robust! Update- one year on, this bag is till going strong! Zips perfect, seams still strong with no sign of getting loose. Been on loads of wet weather / muddy rides too! This bag has been well worth the purchase price. ### ⭐⭐⭐⭐ Good starter pannier *by R***N on 7 August 2026* Reasonable capacity for all three compartments. Fixes securely to bike with Velcro straps, but difficult to stop the unit leaning to the left on my bike rack. Probably fine without my heavy bike lock inside. ## Frequently Bought Together - ROCKBROS Bike Pannier Bag Rear Seat Trunk Panniers Bicycle Rack Rear Carrier Commuter Shelf Large Capacity Luggage Bag Multifunction with Rain Cover 9-12L - ROCKBROS Bicycle Pannier Rack Mountain Bike Pannier Rack Quick Release with Reflector 24-29 Inch With/without Mudguard Aluminium Alloy - ROCKBROS Bike Pannier Bag 25L-32L 100% Waterproof Rear Rack Bicycle Bag for Rear Carrier Bike Handbag for Cycling Touring Travelling --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/162751884-rockbros-bike-rack-bag-9-12l-expandable-trunk-bag-rain](https://www.desertcart.hr/products/162751884-rockbros-bike-rack-bag-9-12l-expandable-trunk-bag-rain) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-09-22*