Looking Beyond the Mockins 64"x39"x5" Extendable Roof Rack? 6 Alternatives Worth a Look

Latest update: October 13, 2026

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You might be considering mockins 64 x39 x5 extendable roof rack alternatives if its specific dimensions or soft shell design do not fit your needs. This carrier offers 20 cubic feet of volume and a 250-pound load capacity. Its extendable frame adapts to varying cargo sizes, and it includes a waterproof bag. These features make it ideal for flexible storage on crossbars.

However, you may prefer a hard shell for better aerodynamics or a different weight limit. The alternatives listed here were chosen because their specs overlap with the original product. This list includes options with varying capacities, from 11 to 35 cubic feet. Some focus on secure, locked storage, while others prioritize rugged durability for off-road use. Each option provides a distinct combination of size, material, and load capacity. You can compare these specifications to find the best fit for your vehicle and travel style.

Our top pick: Mockins 64x39x5 Extendable Roof Rack Cargo Carrier.

How alternatives compare to Mockins

Maxsa Innovations 17 cu ft Hard Shell Cargo Box

The Maxsa Innovations 17 cu ft Hard Shell Cargo Box offers rigid protection where the Mockins provides flexible volume. It features a hard shell construction that shields gear from weather and impact, unlike the Mockins vinyl bag. Its load capacity is 165 lb, which is lower than the Mockins 250 lb limit. The dimensions are 55.1 x 35 x 16.1 inches, making it slightly shorter but taller than the Mockins profile. You choose this if you prioritize secure, aerodynamic storage for cars and SUVs over adjustable space. It suits travelers who want a locked, weatherproof space for their gear without needing to expand their cargo area.

Rugcel Winch 58QT Waterproof Dry Box

The Rugcel Winch 58QT Waterproof Dry Box is built for rugged off-road and camping gear storage. It is a compact, durable container with dimensions of 41 x 17 x 8.5 inches. This model focuses on impact resistance and waterproofing, which differs from the Mockins focus on large, adaptable volume. It is recommended for camping and car use. You should pick this alternative if you value gear protection over streamlined roof storage. The Mockins carrier is larger and designed for crossbars, while this dry box is a rugged container for harsh environments. It is a practical choice for those who need secure, cleanable storage for off-road adventures rather than flexible luggage space.

JEGS 18 cu ft Rooftop Cargo Carrier

The JEGS 18 cu ft Hard Shell Rooftop Carrier provides weatherproof storage with rear access. It has a hard shell type and a load capacity of 110 lb, which is significantly lower than the Mockins 250 lb capacity. Its dimensions are 61.3 x 39 x 12 inches, offering a similar width but a different height profile. You should choose this if you prioritize rear access and tool-free setup over maximum load weight. It fits travelers who want secure, weatherproof storage without the complexity of straps and nets. The Mockins carrier offers more volume and weight capacity, but the JEGS model is better for those who need easy access to their gear from the rear of the vehicle.

PM Performotor 11 cu ft Hard Shell Cargo Box

The PM Performotor 11 cu ft Hard Shell Cargo Box is a compact carrier for light loads. It has a capacity of 11 cubic feet, which is less than the Mockins 20 cu ft volume. Its load capacity is not explicitly listed, but its small size suggests it is for lighter items. The dimensions are 53 x 34 x 15 inches. You should pick this alternative if you prioritize weather resistance and security over maximum volume or weight capacity. It fits drivers who need a secure, compact solution for their car roof. The Mockins carrier is larger and more versatile with its extendable frame, but the PM Performotor is ideal for those with smaller cargo needs who want a dedicated, weatherproof hard shell box.

Rugcel Winch 78L Dry Box

The Rugcel Winch 78L Dry Box is a durable, weather-resistant storage solution for off-road and camping enthusiasts. It is a large, rugged container with dimensions of 42 x 11 x 42 inches. This model prioritizes gear protection over aerodynamic efficiency, which contrasts with the Mockins focus on streamlined roof storage. It is recommended for camping and car use. You should choose this if you need a secure, cleanable container for harsh environments. The Mockins carrier offers more flexible volume and a higher load capacity, but the Rugcel Winch is better for those who need impact-resistant storage for off-road adventures rather than adjustable luggage space for family trips.

TCMT 96L ATV Storage Box with Backrest

The TCMT 96L ATV Storage Box with Backrest is designed for permanent ATV rear storage. It has dimensions of 38.2 x 21.7 x 16.9 inches and weighs 25.6 pounds. This product is not a roof rack alternative but a rear cargo box for ATVs. It requires drilling into the rack for a secure, wobble-free ride. You should pick this if you prioritize durability and a permanent fit for off-road use. It is not suitable for car roof storage. The Mockins carrier is designed for crossbars on cars and SUVs, offering flexible volume and weather protection. The TCMT box is a specialized solution for ATV riders who need sturdy, high-capacity storage on the rear of their vehicle.

Quick picks

#	Product	Best for	Price
1	Mockins 64x39x5 Extendable Roof Rack Cargo Carrier Best overall	Flexible cargo volume on crossbars	Check price of Mockins 64x39x5 Extendable Roof Rack Cargo Carrier on Amazon
2	Maxsa Innovations 17 cu ft Hard Shell Cargo Box Best dual-side opening	Secure, aerodynamic storage for cars and SUVs	Check price of Maxsa Innovations 17 cu ft Hard Shell Cargo Box on Amazon
3	Rugcel Winch 58QT Waterproof Dry Box Best budget	rugged off-road and camping gear storage	Check price of Rugcel Winch 58QT Waterproof Dry Box on Amazon
4	JEGS 18 cu ft Rooftop Cargo Carrier Also great	weatherproof storage with rear access	Check price of JEGS 18 cu ft Rooftop Cargo Carrier on Amazon
5	PM Performotor 11 cu ft Hard Shell Cargo Box Best premium	light loads and secure storage	Check price of PM Performotor 11 cu ft Hard Shell Cargo Box on Amazon
6	Rugcel Winch 78L Dry Box Also great	off-road camping and gear protection	Check price of Rugcel Winch 78L Dry Box on Amazon
7	TCMT 96L ATV Storage Box with Backrest Also great	permanent ATV rear storage	Check price of TCMT 96L ATV Storage Box with Backrest on Amazon

Our 7 picks

Best overall

Mockins 64x39x5 Extendable Roof Rack Cargo Carrier

Best for: Flexible cargo volume on crossbars

Capacity: 20 cu ft
Shell Type: 840D vinyl soft shell
Load Capacity: 250 lbs
Water Resistance: Waterproof
Installation: Buckle straps, ratchet straps
Vehicle Compatibility: Crossbar-equipped vehicles

View on Amazon: Mockins 64x39x5 Extendable Roof Rack Cargo Carrier Affiliate link

This is an extendable roof cargo basket with a 250 lb load capacity. The steel frame adjusts from 43 to 64 inches long. It includes a 20 cu ft waterproof vinyl bag with welded seams. The set comes with straps, a net, and a lock. It suits drivers needing flexible storage for SUVs or cars with crossbars.

Pros

250 lb load capacity for heavy gear
Extendable length from 43 to 64 inches
Includes 20 cu ft waterproof vinyl bag
Comes with straps, net, and combo lock

Cons

Soft vinyl bag offers less security than hard shell
45 lb weight adds vehicle load
Requires crossbars for installation

Good fit if

You need adjustable cargo space
You carry bulky items like camping gear
Your vehicle has crossbars

Skip if

You need a hard shell for security
Your vehicle lacks crossbars
You prefer a fixed-size carrier

Verdict: Mockins 64"x39"x5" Extendable Roof Rack adapts to varying cargo sizes with its sliding frame and included bag. It fits drivers who prioritize flexible volume over rigid protection.

Best dual-side opening

Maxsa Innovations 17 cu ft Hard Shell Cargo Box

Best for: Secure, aerodynamic storage for cars and SUVs

Capacity: 17 cu ft
Shell Type: Hard shell ABS
Opening: Dual-side
Load Capacity: 165 lbs
Water Resistance: Waterproof
Vehicle Compatibility: Cars and SUVs with roof rack

View on Amazon: Maxsa Innovations 17 cu ft Hard Shell Cargo Box Affiliate link

This Maxsa Innovations roof box offers 17 cubic feet of storage with a 165 lb load capacity. It features a hard shell design measuring 55.1 inches long and 35 inches wide. The unit weighs 35.3 pounds and includes a secure locking system with two keys. Its aerodynamic shape helps reduce wind noise and resistance. It fits most cars and SUVs with roof racks.

Pros

17 cubic feet of interior volume
165 lb maximum load capacity
Hard shell construction for weather protection
Includes locking system with two keys
Aerodynamic design reduces wind resistance

Cons

165 lb load limit is lower than some competitors
Single side opening limits access convenience
No universal fit without existing roof racks

Good fit if

You need secure, weatherproof storage for luggage
You have a roof rack on your car or SUV
You prioritize aerodynamic efficiency and reduced noise

Skip if

You require a load capacity exceeding 165 lbs
You need dual-side opening for easier access
Your vehicle lacks crossbars or roof racks

Verdict: Maxsa Innovations 17 Cu Ft Hard Shell Roof Box provides reliable, secure storage for travelers with standard roof racks. It suits those who value aerodynamic efficiency and a locked, weatherproof space for gear.

Best budget