MIDABAO 20 Cubic Waterproof Car Roof Top Carrier: 20 cu ft The Ultimate Soft Roof Bag
Product description
What this is and what it solves
The MIDABAO 20 Cubic Waterproof Duty Car Roof Top Carrier is a soft roof bag designed to add substantial cargo space to a vehicle, with a stated capacity of 20 cubic feet. It’s built to fit cars with or without a roof rack and emphasizes a waterproof, coated construction to protect contents from rain. On paper, it aims to balance high capacity with a practical mounting setup and a storage-friendly form factor.
How it’s put together and how it performs in real use

The bag measures roughly 51.1" x 39" x 17" and ships with a mounting kit that includes six short straps and two long straps for quick attachment. Aimed at versatility, it trades a rigid inner liner for a more malleable, storable design, which can be a real convenience if you’re short on garage space. The PVC coating is marketed as providing waterproof performance beyond simple water resistance, which matters if you’re caught in heavy rain or road spray.
What stands out about the design
The package emphasizes six wide straps plus two 3M-style straps for security. The broader strap count is positioned as a stability benefit, helping to distribute load and reduce movement on the roof.



Best suited use cases
If you regularly run out of cargo room for trips, road trips with extra gear, camping gear, or seasonal equipment, this bag promises a large capacity that can be slid onto any car, with or without a rack. It can be a solid option for travelers who want a more flexible storage solution without committing to a rigid rooftop carrier.
What might hold you back

The trade-off for a soft, highly malleable design is that it may not feel as rigid or as quiet at highway speeds as hard-shell options. Also, while the PVC coating is described as waterproof, real-world performance depends on how well seams are sealed and how the bag is loaded and strapped.
Who it’s for and who should think twice
This MIDABAO model fits drivers needing substantial extra space without a rack dependency and who prefer easier storage when not in use. If you prioritize absolutely maximum rigidity, minimal wind noise, or predictably waterproof performance under extreme conditions, you might want to compare with alternative setups. If you value a higher capacity at a reasonable price and a lightweight, flexible option, this bag aligns better with those needs.



What to check before you buy
- Confirm compatibility with your vehicle’s roof and any existing rack framework.
- Review how the bag is sealed and how the seams are finished to gauge waterproof expectations.
- Consider storage space you have when the bag is not mounted, the malleable design is marketed as easy to store.
- Think about installation time: the six straps plus two longer ones are designed for quick mounting, but the exact process can vary by vehicle.
Practical usage example

Imagine a weekend getaway where you pack camping gear, extra clothes, and the portable grill. The 20 cu ft capacity lets you consolidate bags and boxes on the roof, leaving more cabin space for passengers. You strap it down, run a quick check, and you’re off. If you encounter a downpour, the PVC coating is positioned to help keep loads dry, though you’d still want to check load distribution for stability on long drives.
How this compares to other approaches
Compared with rigid roof boxes, this soft bag offers greater packing flexibility and easier storage when not in use. It might be a better pick for infrequent road trips or shorter trips where you don’t want to invest in a dedicated rack system. If you need absolute maximum waterproof confidence and rugged handling, a hard-shell alternative could be more suitable, but at a higher price and with less room flexibility.



Is it worth it?
Should you buy it? If you need substantial, flexible extra cargo space that can adapt to different car setups and you’re comfortable with a soft carrier, this MIDABAO option could be a sensible balance of capacity, ease of use, and price. It’s worth considering if you value easy storage and broad compatibility over a rigid, premium container.
FAQ
- How much cargo can this bag hold safely? Advertised at 20 cubic feet, but real-world load should respect vehicle weight limits and evenly distribute contents.
- Is it truly waterproof? The product is described as waterproof with PVC coating, but ensure proper sealing and load distribution for heavy rain conditions.
- Will it fit my car without a roof rack? It’s designed to fit with or without a rack, though mounting can vary by vehicle and roof shape.
Final considerations
If you’re aiming for a high-capacity, flexible roof solution and you’re mindful of load balance and installation effort, this MIDABAO model offers a practical route to more cargo space without committing to a rigid system. No perfect option exists for every scenario, but for many casual to semi-regular travelers, it provides a credible balance of capacity, portability, and waterproofing. Think about how often you’ll use it and how you’ll store it when not needed to determine if it’s a fit for your routine.
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