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Budget rooftop cargo bag for occasional trips
Last reviewed: April 2026
At a glance
Why this product
At 21 cu ft and 6 lbs, the CURT 18321 XL gives you serious volume at budget pricing from a recognized brand. For occasional road trips where you just need more space, it's practical. The downside? Weather-resistant construction won't hold up in sustained rain like Thule or Yakima bags, and 21 cu ft of soft bag creates significant wind drag and noise.
Detailed specs
| Volume | 510 L |
| Waterproof Rating | Water Resistant |
| Requires Crossbars | No |
| Works Without Rack | Yes |
| Non-Slip Base | No |
| Reinforced Seams | No |
| Straps Included | Yes |
| Compressible for Storage | Yes |
| Storage Bag Included | Yes |
| Material | Polyester |
Best prices
| Retailer | Price | Status | |
|---|---|---|---|
| Amazon US | Check price | Check availability | Check Price |
Disclosure: MyCargoRacks.com is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more
Disclosure: MyCargoRacks.com is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more
Weather-resistant rooftop cargo bag, 21 cu ft.
Price may vary. Prices and availability are subject to change.
Performance analysis
vs. average in cargo_carrier
Price vs. score for all cargo_carrier
Fitment
| Model | Years | Fit | Requirements |
|---|---|---|---|
| Tahoe(5th Gen) | 2021+ | good | Crossbars needed |
| Model | Years | Fit | Requirements |
|---|---|---|---|
| Explorer(6th Gen) | 2020+ | good |
Community feedback
Based on 2345 reviews
Alternatives
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| CR-V(6th Gen) | 2023+ | good | Crossbars needed |
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| Model | Years | Fit | Requirements |
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| Sportage(5th Gen) | 2023+ | good | Crossbars needed |
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| Model | Years | Fit | Requirements |
|---|---|---|---|
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|---|---|---|---|
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| Forester(5th Gen (SK)) | 2019–2024 | good | Crossbars needed |
| Model | Years | Fit | Requirements |
|---|---|---|---|
| Model Y(1st Gen) | 2020+ | good | Crossbars needed |
| Model | Years | Fit | Requirements |
|---|---|---|---|
| Corolla Cross(1st Gen) | 2022+ | good | Crossbars needed |
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| RAV4(6th Gen) | 2025+ | good | Crossbars needed |
