bing tracking image
  1. Car Roof Bag
  2. CURT
  3. Roof Basket Mount
  4. Extra Large Capacity
  5. Waterproof Material
  6. Extra Long Length
Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft

Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft

Our Price: $152.74
Car Roof Bag
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos


Need help with installation?
Locate installers near me
59x34x18. Store gear on your vehicle's roof with this waterproof cargo bag. Designed to fit inside roof-mounted baskets that measure at least 59" long x 34" wide. Heavy-duty vinyl fabric, welded seams, and a zipper flap keep gear dry. 1-800-940-8924 to order CURT car roof bag part number C18221 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft. Car Roof Bag reviews from real customers.
  • All Info
  • Reviews (48)
  • Q & A (0)
  • Photos

CURT Car Roof Bag

  • Roof Basket Mount
  • Extra Large Capacity
  • Waterproof Material
  • CURT
  • Extra Long Length
  • Black

59x34x18. Store gear on your vehicle's roof with this waterproof cargo bag. Designed to fit inside roof-mounted baskets that measure at least 59" long x 34" wide. Heavy-duty vinyl fabric, welded seams, and a zipper flap keep gear dry.


  • Waterproof, soft-sided cargo bag holds up to 21 cu ft of gear on your vehicle's roof basket
    • Designed to fit Curt roof-mounted cargo basket with extension (C18115-117 - sold separately)
  • Heavy-duty vinyl fabric protects your items
    • Keeps water, dirt, and debris out
    • Resists tears and punctures
    • Blocks UV rays to protect bag and contents from sun damage and fading
  • Welded seams help prevent water leakage
  • Flap keeps dirt and moisture from seeping in through the zipper
    • Secures with hook-and-loop closures (similar to Velcro)
  • Bag unzips around the front and side for easy access
  • 6 UV-resistant straps tie bag to cargo basket for a secure fit
    • Durable, woven polypropylene fabric
    • Plastic buckles let you tighten the straps to eliminate slack
    • Built-in strap keepers secure loose ends to prevent them from flapping in the wind
  • Bag folds up when it's not in use
  • Black color


  • Application: roof-mounted cargo baskets at least 59" long x 34" wide
  • Storage capacity: 21 cu ft
  • Dimensions: 59" long x 34" wide x 18" tall
  • Strap dimensions: 8-7/8' long x 1" wide
  • Weight: 9.6 lbs
  • 1-Year limited warranty

Waterproof Roof-Mounted Storage Bag

Curt Roof Mounted Bag

This waterproof bag fits perfectly inside your Curt roof-mounted cargo basket (C18115-117 - sold separately) or within most other roof-mounted cargo baskets that can accomodate the bag's dimensions. This durable bag holds your gear on your roof, leaving more passenger room and trunk space. It is made of a heavy-duty material with welded seams and zipper flaps to keep your cargo dry. It opens on the front and side for easy loading with zipper pulls that can accommodate a padlock for added security.

Curt Waterproof bag

The Curt cargo bag is constructed of a thick, UV-resistant vinyl that is designed to keep your gear clean and dry. Welded seams keep water from seeping into the bag.

Curt Rain Flap

As an additional measure of protection for your gear, a vinyl flap covers the zipper and secures with hook-and-loop fasteners (similar to Velcro) to keep moisture out. When rain or snow hits, you can continue on your journey, knowing your cargo is safe and dry.

Simple Mounting on Roof Cargo Basket

This bag is designed to be used with a rooftop cargo basket. Position the bag in your basket, and load the bag with cargo from the back and sides. Then zip up the bag and secure the zipper flap.

Curt Bag Integrated Straps

Adjust the integrated polypropylene straps on the bag to the length needed. Then wrap each strap end around the crossbars and side rails of your roof cargo basket so that the bag is secured. Tighten the straps with the sturdy plastic buckles.

Curt Roof Bag Folds Up

When you are not using the bag, just remove it from your roof and fold it up until your next trip.

Lockable Zippers Secure Gear

The zipper pulls have holes through which you can insert a padlock (sold separately) to guard against theft.

18221 Curt Cargo Carrier Bag - Roof Mount - Waterproof - 21 cu ft - 59" Long x 34" Wide x 18" Tall

Item # C18221

Customer Satisfaction Score:

Customer Reviews

Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft - C18221

Average Customer Rating:  4.8 out of 5 stars   (48 Customer Reviews)

59x34x18. Store gear on your vehicle's roof with this waterproof cargo bag. Designed to fit inside roof-mounted baskets that measure at least 59" long x 34" wide. Heavy-duty vinyl fabric, welded seams, and a zipper flap keep gear dry.


1 year review: We used this with our oversized CURT basket throughout our travels within' the US but it wasn't as sturdy as advertised. There are already a couple small rips on the bottom of the bag. It didn't affect the inside but just a little disappointed at the quality. On the bright side, the bag was large enough to cover our totes, duffle bags, light coolers, and other misc. small things. Would buy again, only if the bottom of the bag was double or even tripled sealed so it doesn't rip so easily.

PS: We also did buy the oversized CURT net for extra protection. The straps you see on the pictures DID NOT come with the bag. If it did, we did not receive but a couple straps and the oversized CURT net did its thing!


Extremely satisfied with this product. Curt was the only brand that promoted “waterproof”, not just that but it was the exact size that was needed. Just finished a 2000+ mile trip to Michigan’s UP. We went through a few “toad stranglers” w/o a drop of moisture within the cargo bag. The bag is made of quality coated fabric. The zippers & seams are heavy duty & withstood the high demand of accessing cargo while on the road. Cannot comment on the tie down straps that came w/ the bag b/c we did not use them, using ratchet straps was a little more familiar to secure the bag to our roof basket. Over all a 5 star product. Would purchase again in a heart beat.


Great product. Fairly waterproof. Large, held a lot of luggage. Tie down straps were well placed and strong. Fit perfectly in my roof rack.


I love this bag! It is very large and sturdy. As long as you don't abuse it (Example: Drag it across rough surfaces) and store it properly, I imagine it will last a long time. I have used it 3 times in the 1 year I have had it. I put it on top of my truck tonneau cover because I have tools inside the bed. I opted not to use the straps it came with the bag, so I use rachet straps to tie it to my truck ladder rack.


Ok e owned many “so called “ waterproof bags over the years and Curt is the only one that truly does it’s job. My last one I had for 3 years and never had a problem, until it was stolen out of my garage. I guarantee, you will not be disappointed. Also I love that it zips open on three sides. Very convenient for loading.



Great! Not one complaint! Anyone that complains about this product just looking for a reason to complain.


Is not rainproof at all. All of our luggage that was at the front of the rack were completely soaked after driving through a rainstorm. I believe the issue is that the flap that covers the zipper is not long enough. The size and price is right but I would not purchase again


Pros: It is big and spacious and easy to secure to your vehicles as it has numerous straps! So very versatile for whatever gear you are bringing.

Con: It isn't as durable as I would have thought. I have only used it... maybe four times since purchase and typically use it a week or two during each trip. I don't consider that heavy use. But it started cracking/ tearing a bit after 1-2 uses. Not severely, it is still useable but it just surprised me as my wife and I weren't particularly hard on it.

It's a decent bag, and I think if you ok with replacing it every 3-4 years then it is probably a-ok. If you don't want to invest more every few years, it might not be the bag for you.




After 1 year and many many trips in the back of my F250, this product has held up through rain, snow and highway driving wind. It sat in the back of my truck for 11 days after a 30" snowfall and when I opened it, the contents were cold but not wet.

Joe R.


Continues to be a good buy and provides good service in the back of my F250. Tied it to the top of a Toyota Sienna van for a drive to Minnesota this past winter through rain and snow at highway driving speeds - not a of moisture inside.


These are very challenging to work with when it comes to mounting them to vehicle roof rails and adjusting length of bar to it's equal on both sides. Once they're finally installed they look steong and astethetically appealing. Haven't tested them out with Curt roof rack yet


Works as expected and feels solid


After a year of using this on my camper, I still give it a five. No leaks, very sturdy and stable. I have filled to the limit and probably beyond the limit and the bag has held up very well. We have been through heavy hail and rain conditions and there has been no moisture inside. Very tough bag.


Just as advertised sturdy and well made it would have got 5 stars but I am not a fan of plastic latches on the straps I use ratchet straps with the bag along with the ones that came with and never had a problem other seem to take the stress off the regular ones and move has broke tet


Use this in the back of my pickup. It fits right across the back. Lots of extra waterproof storage.


I really like this bag. The material is thick. The zipper seems very sturdy. It fits well on our Curt roof basket.


Perfect product for family trips .. very big holds alot and very strong and durable, get the matching sets they are waterproof and very strong .. s
Zippers and seams are well done in no way flimsy or cheap strongly recommend this product and others from this maker


Just what I needed. Take my word for this! A must for traveling in a mid size suv to put your luggage on top outside to make room weatherproof Bag. Get this is worth it!


We use this in back of our truck bed when visiting relatives. It has kept everything dry and secure. When we get home it folds up into a nice small package.


Received product on time and was able to install it without any hassle in couple of hours with the help of videos provided and instruction sheet that came along. Definitely recommend etrailer.


Pricing was good & size was perfect dor my truck rack. Package delivered quickly.. I'm a happy camper


I've used this 4 or 5 times for longer road trips (7+ hrs) and it's worked great. Has rained, snowed and been sunny and it's still holding up.


love the bag ! I bought for my son in law who has a small child and new pickup truck.They need to travel with a lot of stuff for their 16 month. With a baby seat in back means the the room for luggage consists of the bed of truck. Curt bad allows for the luggage to be protected in bed of truck. Thanks


Covered my roof well within my existing roof rack . Holds flat stuff well.


Worked perfectly on top of my 2004 highlander Drove from LA to the Carolina’s in mixed weather. No issues


I received the product the day before it was due
and great condition! Removed from the box placed it in the roof basket
and fits like a glove, outstanding quality as always.
Highly recommend this product if you're looking to protect
your gear from the elements when traveling.

Show More Reviews

See what our Experts say about this CURT Car Roof Bag

  • Roof Rack With Cargo basket And Bag For 2018 Nissan Pathfinder
    Yes, The Curt Roof Mounted Cargo Basket part # C18115-117 will certainly fit your 2018 Nissan Pathfinder if it has a factory or aftermarket roof rack installed with cross bars that are not over 3" wide x 1-5/8" tall. If you let me know what type of roof rack you have, I can tell you for sure if the basket will fit. If you do not have a roof rack and have raised side rails that run front to back from the factory, I recommend Thule WingBar Evo Crossbars part # TH711420 and feet part # TH710401...
    view full answer...
    Image 1 for Image 2 for Image 3 for Image 4 for
  • Cargo Bag Recommendation for Fitting Between Truck Cab and Fifth Wheel Hitch
    You would want to go with a narrower bag like the Curt part # C18211 as it is 22 inches wide and would fit better between the cab of your truck and the fifth wheel hitch.
    view full answer...
  • What is the Largest Cargo Bag I Can Install on My Vehicle?
    The largest roof top cargo bag that we carry is the Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft # C18221. The Curt Cargo Bag includes 6 UV-resistant straps that secure the bag to your vehicle. It also includes welded seams to help prevent water leakage. The Curt Cargo Bag does require the Curt Roof Mounted Cargo Basket # C18115-117. In addition to the basket, you will need to have a crossbars system. If you want me to recommend a crossbar system, I would be happy to recommend...
    view full answer...
  • Recommended Roof Basket for 1-1/2 Inch Tall Crossbars on GMC Savana Van
    The Thule Roof Mounted Cargo Basket # TH859XT referenced in your question is compatible with a wide array of crossbar sizes. This roof rack will work for you as long as your crossbars are spread apart between 20 inches and 37 inches. This roof basket has an optional extension in part # TH8591XT and optional lock in the part # TH450400. You could also take a look at a similarly priced basket like the Curt Roof Mounted Cargo Basket # C18115-117. This basket is 64-1/2 inches, and it is...
    view full answer...
  • Can Curt Cargo Bag for Roof Basket be Used on 2021 Toyota 4Runner Cargo Basket
    The Curt Cargo Bag for Roof Basket # C18221 is a universal item so as long as you have places to secure the tie-down straps and the 59" long x 34" wide x 18" tall dimensions works well for your application you can definitely use it for the cargo basket on your 2021 Toyota 4Runner! If your basket is slightly smaller or larger than these bag dimensions it will still work for you.
    view full answer...
  • Will the Curt Cargo Bag # C18221 Mount On a Bare Roof
    The Curt Cargo Bag part # C18221 cannot be mounted to a bare roof but I do have an option that can be, the Rightline Gear Sport 3 Rooftop Cargo Bag part # RL100S30 which mounts using clips that fit inside the doorjamb so no roof rack is needed.
    view full answer...
  • Can Curt Cargo Bag for Roof Basket # C18221 Be Used on 2015 Chevy Tahoe LT
    The Curt Cargo Bag for Roof Basket # C18221 is designed to fit the Curt cargo basket # C18115-117 which you could install on your 2015 Chevy Tahoe if you had a roof rack installed as well. For example the Inno Square Crossbars roof rack part numbers # INB137, # INXP, and # INTR154 is a fit for your Tahoe and is compatible with the # C18115-117. So with this rack and the basket you could use the cargo bag # C18221.
    view full answer...
  • Will Curt Roof Cargo Basket # C18115-117 Fit Factory Crossbars on 2002 Chevy Blazer
    The Curt Roof Mounted Cargo Basket # C18115-117 referenced in your question works with crossbar spreads between 22 and 50 inches. The crossbar spread refers to the distance between the two crossbars on your roof, from center to center. Looking at the picture you attached, it appears that the crossbars can be moved along the length of the side rails to create larger or smaller crossbar spreads. If this is the case, then you should have no problem getting them to the needed spread for the...
    view full answer...
    Image 1 for
  • Recommended Large Roof Cargo Basket Compatible w/ 27 Inch Crossbar Spread of 2019 Mazda CX-9
    We do indeed have a solution that will work perfectly for that Curt # C18221 roof cargo bag. Take a look at the Yakima OffGrid roof cargo basket, part # Y07138-08. The basket measures 62x40 inches, so the cargo bag you'd looked at would fit nicely. You can see demonstration videos for the cargo bag and the basket if you click the provided links.
    view full answer...
  • 2015 Pro4X Xterra Compatibility With Rooftop Cargo Bag Without Basket
    The Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft # C18221 although designed to be used with the Cargo Basket can be used with your factory rack on your Xterra. Since the bag will be sitting directly on the roof and secured to the side rails, I recommend the Non-Skid Roof Protection Pad for Rightline Rooftop Cargo Bags # RL100650. This will help protect your naked roof from scratches and will also utilize a textured surface to keep the cargo bag from sliding around when you brake...
    view full answer...
  • Rooftop Cargo Box Or Basket For A 47 Bar Spread On A Ladder Rack For A 2022 Ford Maverick
    I do have a roof cargo basket that would fit the bar spread. Unfortunately, we do not have a rooftop cargo box that can fit a ladder rack with 47" crossbar spread. If your ladder rack is higher than cab level, the Yakima OffGrid Roof Cargo Basket - Steel - 62" Long x 40" Wide - 165 lbs, part # Y07138-08, will fit your 2022 Ford Maverick. You will have to combine the OffGrid with a cargo bag. I recommend the Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft, part # C18221. This is...
    view full answer...
  • What Rooftop Cargo Bag do You Recommend for Carrying Suitcases on My 2018 Honda Pilot?
    Yes! The attachment clips/straps that come with the Rightline Range 3 Rooftop Cargo Bag - Water Resistant - 18 cu ft # RL100R30 work with your 2018 Honda Pilot with a bare roof. If you have bags that are like the Thule Crossover Rolling Carry-On Suitcase and Backpack with Laptop Sleeve THTCRU-115STR that measures 23-3/16" tall x 15-3/8" wide x 9-1/8" deep, you only have enough room in the Range 3 to carry 2 of those bags. All this being said, if you are looking for a larger rooftop...
    view full answer...
  • Is There a Cargo Box That Will Fit a 2015 Mazda CX 5 With Fixed Mounting Points
    The 2015 Mazda CX 5 has fixed mounting points for a roof rack which are spaced apart much further than normal, 43" to be exact. I am not aware of another set of fixed mounting points that can be used so in order to use a cargo box you'd need to find one that can accommodate the the 43" crossbar spread. I wasn't able to find any cargo boxes that will fit large spread so best option would be to use the Thule Canyon XT # TH859XT-8591XT Cargo Basket along with the Curt Cargo Bag for Roof Baskets...
    view full answer...
  • Can Curt Cargo Bag # C18211 be Installed on the Roof of a Vehicle
    The Curt Cargo Bag # C18211 that you referenced was designed for use on a cargo carrier but there really isn't any problem with you using it on your roof if you would like. I would just make sure that the dimensions 56" long x 22" wide x 21" tall will fit properly on your roof. The main difference between a cargo bag meant for a cargo carrier and one designed for a roof more or less has to do with the position of the straps. If you notice the Curt Roof Bag # C18221 has a few extra straps...
    view full answer...
  • Will the Curt Cargo Basket with Extender Fit on My 2012 Jeep Liberty?
    The Curt Cargo Basket with the Extender # C18115-117 will fit your 2012 Jeep Liberty if you have crossbars that are a maximum of 3 inches wide x 1-5/8 tall. If you need a recommended roof rack system for your factory raised rails, I recommend the following parts: - Yakima CoreBar Crossbars - Steel - Black - 60" Long - Qty 2 # Y00422 - TimberLine Towers for Yakima Crossbars - Raised, Factory Side Rails - Qty 4 # Y33TR - (Optional for extra security) Yakima Same-Key Lock Cores # Y07204 The...
    view full answer...
  • How to Carry Cargo on the Roof of a 2008 Honda Pilot Without Crossbars
    Yes, for a cargo basket that will attach to the to the factory raised side rails on your 2008 Honda Pilot and will not require crossbars you are going to want to use the Surco Safari Rack 5.0 Rooftop Cargo Basket part # SPS4560-1101 with the Clamp-On Adapters part # SP1101. This is the only cargo basket we have for this purpose that will work with your vehicle. Then in order to keep your gear dry you can attach the Curt Cargo Bag for Roof Basket part # C18221 inside of the basket which...
    view full answer...
  • Is There Accessory Bars for the Yakima LockNLoad Platform Rack?
    I have an answer for you. Unfortunately, Yakima does not offer accessory bars for the LockNLoad Platform # Y05047 and the platform will not be able to accommodate a RocketBox Pro like the # Y07192 . With that being said a great alternative is to use a cargo bag like the Curt Cargo Bag - Water Proof - 21 cu ft # C18221. The Curt bag is a great option because it will give you 21 cubic feet of space compared to our largest RocketBox (14 cubic feet). For extra security, you can add the Master...
    view full answer...
  • Whats Best Way to Lock Roof Cargo Bag to Cargo Basket
    Best option would be to wrap an adjustable cable lock around the bag and basket with an adjustable cable lock like the part # 8419DPF which would make it more difficult to steal the contents of the bag. Keep in mind that the material of the bag could be cut relatively easily and there's no way to prevent that. A locking roof cargo box like the Thule Force XT part # TH6357B would be the way to go for the best theft protection.
    view full answer...
  • Recommended Waterproof Roof Bag for Use with Yakima Mega Warrior
    There are a few different sizes of the Yakima Mega Warrior, like the # Y07080, which is 52" x 48" wide. For that I recommend the Rightline Gear Sport 3 Rooftop Cargo Bag - Waterproof - 18 cu ft - 48" x 40" x 19" # RL100S30. This bag would work really well on a cargo basket that size and since it's waterproof, you're going to be protecting your luggage from the elements. If you've got a larger Mega Warrior like the # Y07080-82, the Curt Cargo Bag for Roof Basket - Waterproof - 21 Cu Ft...
    view full answer...
  • Roof Cargo Bag that Can Fit 2011 Chevy Suburban with Naked Roof
    We have larger roof cargo bags that can fit naked roofs like what you have on your 2011 Chevy Suburban with the Rightline Gear Sport 3 part # RL100S30 but the Curt bag # C18221 that you referenced cannot fit without a basket to install on.
    view full answer...
  • Recommended Roof Rack for a 2020 Subaru Forester w/ Side Rails
    Yes, there is a set of crossbars that will fit your Forester and are compatible with the Curt Roof Mounted Cargo Basket item # C18115-117. These mount directly to the side rails of your 2020 Forester and have more than enough capacity for the Curt Cargo Basket. You will want the roof rack by Rhino Rack and it includes the following parts: Rhino-Rack Vortex Aero Crossbars - Aluminum - Black - 54" Long - Qty 2 item # RRVA137B-2 Rhino-Rack SX Series Legs for Vortex Aero Crossbars - Raised...
    view full answer...
  • Which Cargo Bag Will Fit Yakima LoadWarrior with Extension Best
    The best fitting cargo bag for the Yakima Loadwarrior with extension part # Y07070-74 is going to be the Curt cargo bag part # C18221 which measures 59" long x 34" wide x 18" tall. This bag is just a few inches smaller than the internal dimensions of the basket so it would fit well.
    view full answer...
  • Can Curt Cargo Bag for Roor Racks Be Used in Truck Bed
    The Curt Cargo Bag # C18221 is designed to be used on roof racks but there's no reason you can't have it in the bed of your Toyota Tacoma. I don't know if the straps will be able to reach any tie-downs in the bed but you can use some additional straps, like # EM08200, to make it work.
    view full answer...
  • Will the Curt Cargo Bag # C18221 Fit on 2003 Dodge Durango without Roof Mounted Cargo Basket
    I do have a solution for you, however the Curt Cargo Bag # C18221 is designed for use with a roof mounted cargo basket for secure and safe carrying. If you like this Cargo Bag, you can use it along with the Curt Roof Mounted Cargo Basket, part # C18115-117 which would be attached to your vehicle's roof rack. For a large roof bag that does not require a basket, I recommend the Rightline Sport 3XL Rooftop Cargo Bag, part # RL100S30. This bag offers 18 cu ft of space and its versatile harnessing...
    view full answer...

< Previous

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Zack K
Video Edited:
Zack K
Employee Andrew K
Video by:
Andrew K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Lindsey S
Edited by:
Lindsey S
Employee Chelsea B
Written by:
Chelsea B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Savanna B
Test Fit:
Savanna B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.