The Best OMAC Roof Cargo Boxes in 2026: 3 Picks
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This guide covers the best OMAC roof cargo boxes available this 2026. We compared 3 models strictly by their published specifications. OMAC offers hard-shell carriers with dual-side openings, designed for cars with roof mounts. The top pick is the OMAC 8 cu ft Hard Shell Cargo Box. It leads because it balances moderate load capacity with easy side access. These units prioritize practical dimensions and straightforward installation for drivers who need reliable storage without complex setups. The selection focuses on volume, weight limits, and physical fitment data found in the product listings.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | OMAC 8 cu ft Hard Shell Cargo Box Best overall | moderate loads and easy side access | Check price of OMAC 8 cu ft Hard Shell Cargo Box on Amazon |
| 2 | OMAC 11.3 CuFt Hard-Shell Roof Box Best budget | Dual-side access and waterproof storage | Check price of OMAC 11.3 CuFt Hard-Shell Roof Box on Amazon |
| 3 | OMAC 11.3 Cu Ft Dual-Side Roof Box Also great | Convenient side access and quick setup | Check price of OMAC 11.3 Cu Ft Dual-Side Roof Box on Amazon |
Our 3 picks
OMAC 8 cu ft Hard Shell Cargo Box
Best for: moderate loads and easy side access
- Capacity
- 8 Cubic Feet
- Shell Type
- PS UV Protected
- Opening
- Dual-Side Opening
- Load Capacity
- 110 Lbs
- Water Resistance
- Waterproof
- Security
- Security Keys
View on Amazon: OMAC 8 cu ft Hard Shell Cargo Box Affiliate link
This OMAC roof cargo box offers 8 cubic feet of storage with dimensions of 48.3 by 26.1 by 10.6 inches. It features a dual-side opening mechanism for convenient access from either side of your vehicle. The hard shell is made from UV-protected PS material and is waterproof. It supports a maximum load of 110 lbs and comes pre-assembled with steel mounting hardware for straightforward installation on most roof racks.
Pros
- Dual-side opening for easy access
- Pre-assembled for quick installation
- Waterproof and UV-protected PS shell
- Includes steel T-bolts and locks
Cons
- Smaller 8 cubic feet capacity compared to 11.3 cubic feet alternatives
- Lower 110 lbs load limit
- Shorter 48.3-inch length restricts long items
Good fit if
- You need convenient side access to your gear
- You want a pre-assembled unit for easy setup
- You carry moderate loads under 110 lbs
Skip if
- You require maximum storage volume over 10 cubic feet
- You regularly haul loads exceeding 110 lbs
- You need a longer box for skis or lumber
Verdict: OMAC 8 Cu Ft Hard Shell Roof Box is a compact, accessible option for drivers who prioritize easy side loading and quick installation over maximum cargo volume or weight capacity.
OMAC 11.3 CuFt Hard-Shell Roof Box
Best for: Dual-side access and waterproof storage
- Capacity
- 11.3 Cubic Feet
- Shell Type
- Hard-Shell
- Opening
- Dual-Side Opening
- Water Resistance
- Waterproof
- Installation
- Pre-Assembled
- Vehicle Compatibility
- Compatible with all vehicles
View on Amazon: OMAC 11.3 CuFt Hard-Shell Roof Box Affiliate link
The OMAC 11.3 cubic foot roof box offers 320 liters of storage in a 52 x 32 x 12 inch hard shell. It weighs 35.8 pounds and features dual-side opening for easy access. The unit is pre-assembled and made from UV-protected PS material. You get waterproof protection for your gear. This carrier fits most roof racks. It suits travelers needing reliable, extra space without complex setup.
Pros
- 11.3 cubic feet (320 L) capacity
- Dual-side opening for convenient access
- Pre-assembled for quick installation
- Waterproof and UV-protected hard shell
Cons
- Heavier at 35.8 pounds than some competitors
- Fixed 12-inch height limits low-profile racks
- No mention of aerodynamic drag reduction features
Good fit if
- You need dual-side access for tight parking spots
- You want a pre-assembled unit to save time
- You require waterproof protection for all weather
Skip if
- You need a slim profile under 12 inches
- You prioritize lightweight carriers under 30 pounds
- You need a smaller 8 cubic foot capacity
Verdict: OMAC 11.3 Cu Ft Hard Shell Roof Box is a solid choice for you if you value easy access and waterproof storage. It fits drivers who need durable, ready-to-use space for road trips.
OMAC 11.3 Cu Ft Dual-Side Roof Box
Best for: Convenient side access and quick setup
- Capacity
- 11.3 cu ft
- Shell Type
- PS UV Protected
- Opening
- dual-side
- Water Resistance
- waterproof
- Installation
- pre-assembled
- Vehicle Compatibility
- all vehicles
View on Amazon: OMAC 11.3 Cu Ft Dual-Side Roof Box Affiliate link
This OMAC roof cargo box offers 11.3 cubic feet of storage, measuring 52 by 32 by 12 inches. It weighs 35.8 pounds and is constructed from UV-protected PS material with a matte black finish. The dual-side opening allows access from either side of your vehicle. It comes pre-assembled for quick installation and is rated waterproof for all weather conditions.
Pros
- Dual-side opening for easy access
- Pre-assembled for quick installation
- Waterproof and UV-protected shell
- 11.3 cubic feet capacity
Cons
- Heavier build at 35.8 pounds
- Standard 12-inch height limits aerodynamics
- PS plastic shell is less rigid than aluminum
Good fit if
- You need side access without exiting the vehicle
- You want a pre-assembled unit for fast setup
- You park in sunny climates and need UV protection
Skip if
- You prioritize maximum aerodynamic efficiency with a low profile
- You need a lightweight carrier under 30 pounds
- You require a rigid aluminum shell for heavy loads
Verdict: OMAC 11.3 Cu Ft Dual-Side Roof Box is a practical option for travelers who value convenient side access and quick installation over ultra-slim aerodynamics.
Specifications side by side
| Spec | OMAC 8 cu ft Hard Shell Cargo Box | OMAC 11.3 CuFt Hard-Shell Roof Box | OMAC 11.3 Cu Ft Dual-Side Roof Box |
|---|---|---|---|
| Capacity | 8 Cubic Feet | 11.3 Cubic Feet | 11.3 cu ft |
| Shell Type | PS UV Protected | Hard-Shell | PS UV Protected |
| Opening | Dual-Side Opening | Dual-Side Opening | dual-side |
| Load Capacity | 110 Lbs | not stated | not stated |
| Water Resistance | Waterproof | Waterproof | waterproof |
| Security | Security Keys | not stated | not stated |
| Installation | pre-assembled | Pre-Assembled | pre-assembled |
| Vehicle Compatibility | all vehicles | Compatible with all vehicles | all vehicles |
| Dimensions | 48.3 Inch x 26.1 Inch x 10.6 Inch | 52 x 32 x 12 inches | 52 x 32 x 12 in |
| Vehicle Type | Car | Car | Car |
| Mount Type | Roof Mount | Roof Mount | Roof Mount |
| Weight | not stated | 35.8 pounds | 35.8 pounds |
| Size | 8 Cubic Feet | 320 L | 320 L |
| Color | Matt Black | black | Black |
| Model | 96G3300B | 96ART320 | AMZUS96ART320 |
OMAC Roof Box Lineup Overview
OMAC offers three hard-shell carriers for car roof mounts. The OMAC 8 cu ft model is a compact choice with dual-side opening. Its dimensions are 49 by 28 by 12 inches. This unit suits drivers who need easy side access without maxing out volume. It is a practical option for moderate loads. The shell is matte black with model number 96G3300B. You get quick installation and straightforward use. It is the best overall pick for accessibility. The other two models share similar dimensions. They are 52 by 32 by 12 inches. Both hold 320 liters or 11.3 cubic feet. Each weighs 35.8 pounds. They are black and designed for waterproof storage. The OMAC 11.3 CuFt Hard-Shell Roof Box and the OMAC 11.3 Cu Ft Dual-Side Roof Box are also great for road trips. They prioritize space over slim profiles.
Who Should Buy OMAC Boxes
OMAC’s range covers 8 to 11.3 cubic feet. The smallest unit measures 49 by 28 by 12 inches. Larger models expand to 52 by 32 by 12 inches. All units feature hard shells with dual-side openings. This design suits drivers who need easy access from either side of the vehicle. You will not find slim-profile or aerodynamic designs in this lineup. The boxes prioritize volume and access over low wind resistance. If you require a compact carrier for smaller cars, the 8 cu ft model fits. For more space, the 11.3 cu ft options provide 320 liters of storage. All are designed for standard car roof mounts.
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How to Choose the Right OMAC Roof Box
-
Check Opening Accessibility
All three OMAC models feature dual-side opening mechanisms. This specification allows you to load gear from either side of the vehicle. You do not need to climb onto the roof or reach across the entire box. This feature is particularly useful in tight parking spaces. Whether you select the compact 8 cu ft model or the larger 11.3 cu ft options, the side access remains consistent. It simplifies daily loading routines and reduces physical strain when securing your cargo.
-
Compare Cargo Volume
Capacity ranges from 8 to 11.3 cubic feet across the lineup. The smallest unit, the OMAC 8 cu ft Hard Shell, measures 49 by 28 by 12 inches. Larger models like the 11.3 CuFt Hard-Shell Roof Box expand to 52 by 32 by 12 inches. You should match the volume to your typical trip length. Short weekend drives may only require the compact 8 cu ft option. Longer road trips with multiple passengers will benefit from the expanded 320-liter capacity found in the larger units.
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Verify Vehicle Compatibility
All listed OMAC carriers are designed specifically for car roof mounts. You must ensure your vehicle has compatible roof rails or crossbars. The mounting type is standard across the range, but the physical dimensions vary. The 8 cu ft model is narrower at 28 inches wide. The larger models are 32 inches wide. You need sufficient roof space to accommodate the width and length without obstructing visibility. Check your vehicle’s roof load limits before installing any of these hard-shell carriers.
-
Assess Weight Capacity
The larger 11.3 CuFt models list a weight of 35.8 pounds. This is the empty weight of the carrier itself. You must subtract this from your vehicle’s total roof load limit to determine usable cargo weight. The lighter, compact 8 cu ft model does not list its empty weight in the provided data. You should contact the manufacturer for this specific spec if weight is a critical constraint. Always distribute weight evenly inside the box to maintain vehicle stability while driving.
-
Consider Aerodynamic Profile
The height of all OMAC boxes is 12 inches. This uniform height creates a similar aerodynamic profile across the range. You will notice minimal difference in wind noise or fuel economy between the 8 cu ft and 11.3 cu ft models. The primary difference is the length and width. The larger units are longer at 52 inches and wider at 32 inches. This increased surface area may slightly affect drag. However, the hard-shell design generally reduces turbulence compared to soft-sided alternatives.
Frequently asked questions
What is the smallest OMAC roof box available?
The OMAC 8 cu ft Hard Shell Cargo Box is the most compact option in this lineup. It measures 49 inches in length, 28 inches in width, and 12 inches in height. This smaller footprint makes it suitable for vehicles with limited roof space or lower weight capacities.
Do all OMAC roof boxes open from the side?
Yes, every model in this group features a dual-side opening design. This specification allows you to access your gear from either side of the vehicle without needing to climb onto the roof. It simplifies loading and unloading during travel stops.
Which OMAC box has the largest storage capacity?
The OMAC 11.3 CuFt models offer the maximum volume in this selection. Both the Best Budget and Also Great picks provide 320 liters of space. They share identical dimensions of 52 by 32 by 12 inches, offering ample room for larger road trip loads.
What are the dimensions of the largest OMAC carrier?
The largest units measure 52 inches in length, 32 inches in width, and 12 inches in height. These two 11.3 cubic foot models share these exact external measurements. Their width is slightly wider than the entry-level 8 cu ft version.
How heavy is the 11.3 cubic foot OMAC box?
The 11.3 CuFt Hard-Shell Roof Box weighs 35.8 pounds. This weight applies to both the Best Budget and Also Great selections. You should verify your vehicle’s roof rack load limit to ensure it can safely support this empty carrier weight.
Are these carriers compatible with all car roof racks?
These boxes are designed for roof mounts on cars. They utilize a standard roof mount system. You must ensure your vehicle has compatible crossbars or roof rails. The hard shell construction requires secure attachment points to handle wind resistance and load weight.
What color options are available for OMAC roof boxes?
The available colors include Matt Black and standard black. The 8 cu ft model comes in Matt Black. The larger 11.3 cu ft models are listed as black. These neutral tones help the carriers blend with most vehicle exteriors.