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Many Outback owners eventually run out of interior space for luggage, camping gear, and family travel essentials.
Fortunately, the Outback’s long roof makes it well suited for cargo boxes. It can accommodate a wide range of sizes and setups.
The key is choosing a box that fits your travel habits. In many cases, fitment and usability matter more than maximum capacity.
Why The Outback Works So Well With Cargo Boxes
Longer Roof Length Creates More Flexibility
The Outback’s longer roof provides more room for crossbar placement and cargo box positioning.
This added space makes it easier to achieve proper fitment and maintain rear hatch clearance, especially with larger boxes.
Why Outback Owners Often Choose Larger Boxes
Because the Outback is commonly used for road trips, camping, and family travel, many owners benefit from larger cargo boxes.
The vehicle’s roof dimensions can comfortably accommodate bigger boxes than many smaller vehicles, providing additional storage without overcrowding the cabin.
Cargo Boxes Add Storage Without Sacrificing Passenger Space
One of the biggest advantages of a cargo box is that it increases carrying capacity without reducing interior comfort.
Bulky items like luggage, camping gear, strollers, and coolers can move to the roof, leaving more room inside for passengers and everyday travel.
Understanding Cargo Box Sizes
Small Cargo Boxes (10-14 Cubic Feet)
Small cargo boxes are well suited for solo travelers, couples, and everyday overflow storage.
They provide extra space for luggage, sports equipment, and weekend trips while maintaining a compact footprint. Many owners choose this size when they want additional storage without adding excessive bulk.
Medium Cargo Boxes (15-17 Cubic Feet)
Medium cargo boxes offer a balance between capacity and everyday usability.
They provide enough room for family road trips, camping gear, and seasonal equipment while remaining easy to load and live with. For many Outback owners, this size range offers the best overall versatility.
Large Cargo Boxes (18-20 Cubic Feet)
Large cargo boxes are popular with families and frequent travelers.
They provide enough capacity for multiple suitcases, camping gear, strollers, and bulky items. The Outback’s roof dimensions make this size range practical for many owners.
XL Cargo Boxes (21+ Cubic Feet)
XL cargo boxes maximize storage capacity and are best suited for owners who regularly carry large amounts of gear.
They work well for extended trips and larger families, but proper fitment and hatch clearance become increasingly important as box size increases.
| Size Category | Typical Capacity | Best For |
| Small | 10-14 cu ft | Solo travelers, couples, weekend trips |
| Medium | 15-17 cu ft | Most owners, family travel, camping |
| Large | 18-20 cu ft | Families, long road trips |
| XL | 21+ cu ft | Large families, extended vacations |
What Size Cargo Box Fits An Outback Best?
Best Size For Most Owners
For most Outback owners, a medium cargo box in the 15-17 cubic foot range offers the best balance of capacity and everyday usability.
This size provides plenty of room for luggage, camping gear, and seasonal equipment without becoming overly large or difficult to manage.
Best Size For Couples
Couples often find that small to medium cargo boxes provide all the extra storage they need.
A box in the 10-17 cubic foot range can comfortably handle weekend trips, vacation luggage, and outdoor gear while keeping the overall setup compact.
Best Size For Families
Families typically benefit from larger boxes in the 18-20 cubic foot range.
The additional capacity helps accommodate suitcases, coolers, strollers, and other bulky items that quickly fill the Outback’s cargo area during longer trips.
Best Size For Camping And Road Trips
Camping gear and extended travel often demand more storage space.
Medium and large cargo boxes usually provide enough room for tents, sleeping bags, chairs, and other equipment while preserving passenger comfort inside the vehicle.
When An XL Box Makes Sense
XL cargo boxes make the most sense for large families, extended vacations, and owners who regularly carry bulky gear.
While the Outback can accommodate these larger boxes, proper fitment and hatch clearance become increasingly important as box size increases.
| Use Case | Recommended Size |
| Daily Travel | Medium |
| Couples | Small-Medium |
| Families | Large |
| Camping & Road Trips | Medium-Large |
| Winter Sports | Large |
| Large Families | XL |
Bigger Isn’t Always Better
Weight And Loading Considerations
Larger cargo boxes offer more storage, but they are also heavier and more difficult to load.
Bulky boxes can be harder to manage, especially when lifting gear onto the roof. For many owners, a slightly smaller box is easier to live with and still provides plenty of capacity.
Garage Clearance
As cargo boxes get larger, overall vehicle height becomes a bigger concern.
Owners who regularly park in garages or use low-clearance areas should consider height limitations before choosing the largest box available.
Fuel Economy And Wind Noise
Larger boxes create more aerodynamic drag and can increase wind noise, particularly at highway speeds.
While the impact varies, bigger boxes are generally more noticeable during daily driving and long road trips.
Living With A Large Box Year-Round
Many owners leave their cargo boxes installed for extended periods, which makes everyday usability important.
A large box can provide impressive storage capacity, but it also adds weight, height, and bulk. For most Outback owners, choosing a size that fits their typical travel needs results in a more practical setup.
Hatch Clearance Matters More Than Size Alone
Why Length Matters
Cargo box length often has a bigger impact on usability than overall capacity.
Longer boxes can extend farther over the rear of the vehicle, increasing the chances of interfering with the Outback’s rear hatch when opened.
Crossbar Positioning And Bar Spread
Proper crossbar placement plays a major role in maintaining hatch clearance.
Adjusting bar spread and box position can often solve clearance issues without requiring a smaller cargo box. In many cases, setup flexibility matters more than box size.
Common Clearance Problems
One of the most common mistakes is focusing only on cubic feet and ignoring overall box dimensions.
A box that is too long or mounted too far back can prevent the hatch from fully opening, making loading and unloading more frustrating.
Why Fitment Matters More Than Cubic Feet
Two cargo boxes with similar capacities can have very different dimensions and fitment characteristics.
For most Outback owners, proper fitment, box length, and crossbar positioning are more important than maximizing storage volume. A well-fitted box is usually easier to live with than simply choosing the largest option available.
Cargo Box Size By Outback Generation
2010-2014 Outback
The fourth-generation Outback provides enough roof space for a wide range of cargo box sizes.
Most owners find that medium and large boxes offer the best balance of capacity and fitment, while larger boxes may require closer attention to hatch clearance.
2015-2019 Outback
The fifth-generation Outback’s longer roof and improved roof rack systems make it well suited for larger cargo boxes.
Many owners comfortably use boxes in the 15-20 cubic foot range for family travel, camping, and road trips.
2020-Present Outback
Current-generation Outbacks offer excellent flexibility for cargo box setups.
Medium and large boxes work well for most owners, while XL boxes are possible with proper fitment and attention to rear hatch clearance.
Outback Wilderness Considerations
The Outback Wilderness provides the same generous roof dimensions as the standard Outback, but owners should still verify crossbar compatibility and cargo box fitment.
Its higher ride height can make loading more challenging, making ease of access and overall usability important factors when choosing box size.
What Actually Works (Based On Real Use)
Most Owners Are Happiest With Medium And Large Boxes
For most Outback owners, medium and large cargo boxes provide the best balance of storage capacity and everyday usability.
They offer enough space for vacations, camping gear, and family travel without becoming unnecessarily bulky.
Families Tend To Outgrow Smaller Boxes Quickly
Smaller boxes can work well for couples and weekend trips, but families often find themselves needing more space over time.
Strollers, coolers, and extra luggage can quickly fill a smaller box, making larger options more practical for long-term use.
The Biggest Box Isn’t Always The Most Practical
Maximum capacity does not automatically mean maximum convenience.
Larger boxes can add weight, height, and loading challenges that many owners do not need. Choosing a size that matches your typical travel habits usually leads to a more usable setup.
Proper Fitment Matters More Than Maximum Capacity
The best cargo box is one that fits the Outback properly and works with your crossbar setup.
For most owners, hatch clearance, box length, and overall usability matter far more than squeezing out a few extra cubic feet of storage.
FAQs
What size cargo box fits a Subaru Outback?
Most Outbacks comfortably accommodate cargo boxes ranging from 15 to 20 cubic feet. Proper fitment and hatch clearance are more important than capacity alone.
Is an 18 cubic foot cargo box too big for an Outback?
No. An 18 cubic foot box is a popular size and works well for many families and road-trip setups.
Can an Outback fit a 21 cubic foot cargo box?
Yes. Many Outbacks can accommodate a 21+ cubic foot box, but fitment and hatch clearance become more important.
Which cargo box size is best for a family of four?
For most families, an 18-20 cubic foot cargo box provides a good balance of capacity and practicality.
Does the Outback Wilderness fit larger cargo boxes?
Yes. The Outback Wilderness offers similar roof dimensions and can support larger boxes with the proper crossbar setup.
Do larger cargo boxes hurt gas mileage?
Yes, larger boxes create more aerodynamic drag and may reduce fuel economy, especially at highway speeds.
Can you still open the rear hatch with a large cargo box?
Usually yes, provided the box is properly sized and positioned. Hatch clearance should always be verified during installation.
Is a larger cargo box harder to live with year-round?
It can be. Larger boxes add weight, height, and bulk, which can make everyday driving and storage less convenient.
Final Thoughts
The best cargo box size depends on your travel habits and storage needs.
For most Outback owners, medium and large boxes offer the best balance of capacity and usability. Fitment and hatch clearance usually matter more than maximum cubic feet.
The goal is choosing a setup that adds storage without adding unnecessary size or complexity.
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