1. Introduction
This user manual provides comprehensive instructions for the safe and effective use of your Zacro 425L Car Rooftop Cargo Bag. This durable and waterproof cargo bag is designed to expand your vehicle's storage capacity, making it ideal for travel and outdoor adventures. Please read this manual thoroughly before installation and use to ensure optimal performance and safety.
2. Safety Information
Adherence to the following safety guidelines is crucial for preventing accidents and damage to your vehicle or cargo bag.
- Weight Distribution: Distribute cargo weight evenly inside the bag. Do not exceed your vehicle's roof load capacity. Refer to your vehicle's owner's manual for specific limits.
- Secure Fastening: Always ensure all straps and buckles are securely fastened and tightened before driving. Regularly check strap tension during long journeys.
- Visibility: Ensure the cargo bag does not obstruct your view or vehicle lights.
- Speed Limits: Drive at appropriate speeds, especially in adverse weather conditions or on uneven terrain. High speeds can increase wind resistance and stress on the bag and mounting system.
- Clearance: Be aware of increased vehicle height when entering garages, car washes, or low-clearance areas.
- Weather Conditions: While the bag is waterproof, extreme weather conditions (e.g., heavy storms, strong winds) may require extra caution.
- Sharp Objects: Avoid placing sharp or abrasive objects directly inside the bag without proper padding to prevent damage to the material.
3. Package Contents
Verify that all items are present in your package:
- 1 x Zacro 425L Car Rooftop Cargo Bag
- 8 x Adjustable Straps (pre-attached or separate)
- 1 x Storage Bag
- 1 x Anti-slip Mat (may be included depending on package)
- 6 x Door Hooks (for vehicles without roof racks)
- 1 x Small Lock (for zipper security)

Image: Zacro 425L Car Rooftop Cargo Bag with its straps, buckles, and storage bag.
4. Specifications
| Feature | Detail |
|---|---|
| Brand | Zacro |
| Model | 425L |
| Volume | 425 Liters (approx. 15 cubic feet) |
| Dimensions (L x W x H) | 111.76 x 85.85 x 41.91 cm (44 x 33.8 x 16.5 inches) |
| Weight | 2.8 Kilograms (approx. 6.17 lbs) |
| Material | Polyvinyl chloride (PVC) with reinforced nylon laminate |
| Water Resistance | Waterproof (Triple waterproof design with sealed seams) |
| Closure Type | Zipper & Hook & Loop (Velcro flap) |
| Shell Type | Soft |
| Mounting Type | Roof mounting (compatible with roof racks or door frame hooks) |
| UPC | 749390635941 |

Image: The cargo bag mounted on a car roof, illustrating its dimensions (112cm length, 86cm width, 43cm height).
5. Setup and Installation
The Zacro cargo bag is designed for easy installation on various vehicle types, with or without existing roof racks.
5.1 Compatibility
The bag is compatible with:
- Vehicles with side rails
- Vehicles with crossbars
- Vehicles with roof baskets or trays
- Vehicles without any roof rack (using door frame hooks)

Image: Illustrations demonstrating compatibility with side rails, no roof rack, crossbars, and roof baskets/trays.

Image: Examples of the cargo bag installed on different types of vehicles, including SUVs and sedans.
5.2 Installation Steps (General)
- Prepare the Bag: Unfold the cargo bag and place it on the vehicle's roof. If using an anti-slip mat (recommended), place it under the bag first.
- Assemble Buckles and Straps: Ensure all buckles are correctly attached to their respective straps.
- Secure Straps:
- With Roof Rack (Side Rails/Crossbars): Pass the adjustable straps around your vehicle's roof rack bars. Ensure the straps are not twisted.
- Without Roof Rack (Door Frame Hooks):
- Gently pull down the weather stripping/door seal around your car's door frame.
- Attach the provided door hooks to the metal door frame.
- Push the weather stripping back into place, securing the hooks.
- Attach the cargo bag's straps to these hooks.
- Tighten and Secure: Pull all straps firmly to secure the bag to the roof. Ensure the bag is centered and stable. The bag should not move or flap. Tuck away any excess strap length to prevent flapping during travel.
- Load Cargo: Load your items into the bag, distributing weight evenly. Close the waterproof zipper and secure the Velcro flap over it.

Image: Visual guide showing the three main phases of installation: assembling buckles, fixing straps through roof bars, and ensuring the bag is securely fastened.

Image: Step-by-step instructions for installation without a roof rack, demonstrating how to use door frame hooks by pulling down the weather stripping.
6. Operation and Usage
6.1 Loading the Bag
- Open the main zipper and the Velcro flap.
- Place items inside, starting with heavier items at the bottom and center to maintain vehicle stability.
- Utilize the bag's flexible soft-shell design to accommodate irregularly shaped items.
- Avoid overfilling the bag to ensure the zipper can close properly and the material is not unduly stressed.
- For maximum waterproofing, ensure the zipper is fully closed and the protective Velcro flap is securely sealed over it. The side without the zipper should face the front of the vehicle.

Image: The cargo bag demonstrating its waterproof capabilities in rainy conditions, highlighting sealed seams and durable material.

Image: Detailed views of the bag's construction, including reinforced strap stitching, waterproof zipper, wide Velcro flap, and robust buckles.
6.2 Driving with the Cargo Bag
- Before each drive, double-check all straps for tightness and security.
- During long trips, periodically stop and re-check the straps to ensure they remain taut.
- Be mindful of crosswinds and sudden braking, as these can affect vehicle handling with a rooftop load.
- The bag is designed to withstand various weather conditions, including rain and snow.
7. Maintenance
- Cleaning: Clean the cargo bag with a damp cloth and mild soap. Do not use harsh chemicals or abrasive cleaners. Rinse thoroughly and allow to air dry completely before storage.
- Storage: When not in use, fold the bag compactly and store it in its provided storage bag in a cool, dry place away from direct sunlight and extreme temperatures.
- Inspection: Periodically inspect the bag, zippers, straps, and buckles for any signs of wear, tear, or damage. Replace or repair as necessary to ensure continued safe operation.

Image: The cargo bag on a vehicle, highlighting its key features such as waterproof design, tear resistance, ease of installation, large capacity, and durability.

Image: The cargo bag demonstrating its resistance to various elements: dust, water, UV rays, and snow.

Image: The cargo bag's interior capacity filled with luggage, and its compact folded dimensions for storage.
8. Troubleshooting
- Bag is flapping or noisy during driving:
Ensure all straps are pulled taut and securely fastened. Tuck away any excess strap length. Verify the bag is centered and evenly loaded. An anti-slip mat can also help reduce movement.
- Water leakage:
Ensure the zipper is fully closed and the Velcro flap is completely sealed over the zipper. The side without the zipper should face the front of the vehicle to minimize water ingress from wind and rain. Check for any punctures or tears in the material.
- Difficulty closing zipper:
The bag may be overfilled. Remove some items to reduce tension on the zipper. Ensure items are not snagging the zipper path.
- Bag feels unstable:
Re-check all strap connections and tension. Ensure weight is evenly distributed inside the bag. If using door hooks, confirm they are properly seated under the weather stripping.
9. Warranty and Support
Zacro is committed to providing friendly customer service and a 100% service guarantee for your rooftop cargo bag.
If you have any questions, concerns, or require assistance with your Zacro 425L Car Rooftop Cargo Bag, please do not hesitate to contact the seller's customer service. They are dedicated to ensuring your satisfaction and will provide support for any warranty-related inquiries.
For the quickest resolution, please have your purchase details (e.g., order number, date of purchase) ready when contacting support.

