# COSTWAY 15 cu ft PVC Car Roof Bag

The COSTWAY car roof bag is a soft-sided rooftop carrier with a listed 15 cubic feet of capacity, an anti-slip mat and multiple attachment options. Its waterproof rating and 424-litre volume are listing claims, while another feature description gives 414L, so buyers should confirm which capacity applies to this version.

- [Original product page](https://bargainpostbox.co.uk/product/costway-15-cu-ft-pvc-car-roof-bag)
- [View offer](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: COSTWAY
- Category: Cars & Motorcycles > Vehicle Accessories
- Price: 44.95 GBP
- Previous price: 54.95 GBP
- Discount: 18%
- Price checked: 2026-11-12T14:42:54.008Z
- Rating: 4.5 / 5
- Reviews: 165

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The title identifies this as the 15 cubic feet version, but the listing gives two different litre capacities: 414L in the title and feature text, and 424 Litres in product details.
- The manufacturer describes a triple-layer 840D PVC construction, reinforced strap seams and a waterproof zipper cover.
- Installation features described include 10 reinforced straps and six door hooks, with fitting claimed for vehicles with or without roof racks.
- The anti-slip mat is intended to reduce movement and help protect the vehicle roof from scratches.
- The manufacturer advises orienting the logo side without the zipper towards the front of the vehicle.

## Pros

- Soft construction can be folded for storage when not in use.
- An anti-slip mat is listed, and the feature description also specifies straps and door hooks for securing the carrier.
- The stated capacity is aimed at adding luggage space for trips and camping.

## Specifications

### Identity
- Brand: COSTWAY
### Dimensions and installation
- Mounting type: Roof Mount
- Dimensions: 112L x 86W x 43H centimetres
### Materials and protection
- Material: Polyvinyl Chloride \(PVC\)
- Water resistance: Waterproof
- Shell type: Soft
- Colour: Black+Orange
### Capacity and fit
- Listed item volume: 424 Litres
- Automotive fit type: Universal Fit
- Closure type: Zipper

## Before you buy

- The capacity is contradictory across the listing: the title and feature text say 15 cubic feet/414L, while product details state 424 Litres. The title also mentions 15/21 cubic feet, so confirm the selected size and capacity before buying. For prolonged rain, the manufacturer says to store the bag indoors to avoid water immersion and to ensure it is completely dry before use.

## In the box

- 1 x Car Roof Bag (Included)
- 1 x Non-Slip Mat (Included)
- 1 drawstring storage bag (Check selected pack): Mentioned in the feature description but absent from the explicit included-components list. Check the selected listing.
- 6 door hooks (Check selected pack): Mentioned in the feature description but absent from the explicit included-components list. Check the selected listing.
- 1 luggage lock (Check selected pack): Mentioned in the feature description but absent from the explicit included-components list. Check the selected listing.

## A good fit for

- Drivers who need extra roof luggage space for holidays, camping or road trips.
- Buyers looking for a soft carrier with an anti-slip mat and attachment options for vehicles with or without roof racks, subject to fitment.

## Less suited to

- Buyers who need an unambiguous capacity specification or a rigid roof box.
- Use involving prolonged exposure to rain or water immersion, contrary to the manufacturer’s care guidance.

## Customer feedback

Customer feedback highlights perceived quality, sturdiness, water resistance, extra space and ease of fitting, including a report of use without roof bars. Feedback also describes a secure fit but says tightening the straps can take effort and feel fiddly. For buyers, that trade-off matters when setting up the listed strap-and-hook arrangement. These are customer-reported impressions and do not resolve the listing’s differing capacity figures or establish performance in prolonged rain.
- Positive themes: Customers report good quality and sturdiness, and describe the bag as providing extra space and being straightforward to fit.
- Negative themes: Customers report that tightening the straps can take effort and feel fiddly.
- Mixed feedback: Feedback describes the bag as securing firmly while noting that getting the straps tightened can be awkward.

## Frequently asked questions

### What capacity is this COSTWAY roof bag?
The title and feature description say 15 cubic feet/414L, while the product details list 424 Litres. The title also refers to 15/21 cubic feet, so check the selected version and capacity with the listing.
### Can it be fitted without roof bars?
The feature description says it can be installed with or without roof racks using straps and door hooks. Check that the fitting method suits your specific vehicle.
### Is the bag suitable for prolonged heavy rain?
The listing claims waterproof construction, but its care note says to store the bag indoors during prolonged rainy weather to avoid water immersion, and to ensure it is completely dry before use.
### What is included?
The explicit included-components list names one car roof bag and one non-slip mat. A feature description additionally claims a storage bag, six door hooks and a luggage lock, so check the selected listing to confirm those items.

## Offer details

- For prolonged rainy weather, store indoors to avoid water immersion and ensure the bag is completely dry before use.

## Alternative options

- [COSTWAY 15/21 Cubic Feet Car Roof Bag, 100% Waterproof Roofing Cargo Carrier with Anti-Slip Mat, Combination Lock & Straps, Rooftop Luggage Storage Box \(Black+Orange, 15 Cubic Ft/425L\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [Car Roof Bag 21Cubic/595L,Waterproof Roof Box includes Anti-Slip Mat,6 Heavy-Duty Straps & Storage Bag, Waterproof UV resistant for Cars, SUVs,Travel, Holidays](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [GADLANE Car Roof Bag - 20 Cubic Feet \(Black\) \| Waterproof Roof Box for Cars with/without Roof Rack, Anti-Slip Mat, 6 Door Hooks, Combination Lock Storage Bag, 820D Material](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [BOYUJK Car Roof Bag - 15 Cubic/425 L, Waterproof, No Rack Needed, Anti-Slip Mat & 6 Heavy-Duty Straps, Folding Soft Bag \(Orange, 425 L\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [GADLANE Car Roof Bag - 20 Cubic Feet / 550L \(Black\) \| Waterproof Roof Box Storage for Car with/without Roof Rack, 6 Sturdy Straps, Anti-Slip Mat, Storage Bag for Cars SUVs Travel](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [COSTWAY 14 Cubic Feet/400L Car Roof Bag, Waterproof Foldable Roofing Cargo Carrier with 4 Reinforced Straps, Anti-Slip Bottom & Storage Bag, Soft-Shell Rooftop Luggage Storage Box for All Cars \(Black\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [Rymopuey Roof Bag, Waterproof Car Roof Bag No Rack Needed, Car Roof Box with Anti-Slip Mat and 8 Heavy-Duty Straps, Folding Soft Roof Box for Cars with/Without Rack \(Orange-20Cubic\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [GADLANE Car Roof Bag - 15 Cubic Feet \(Black\) \| Waterproof Roof Box for Cars with/without Roof Rack, Anti-Slip Mat, 4 Door Hooks, Combination Lock Storage Bag, 820D Material](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [GADLANE Car Roof Bag - 15 Cubic Feet / 400L \(Black\) \| Waterproof Roof Box Storage for Car with/without Roof Rack, 4 Sturdy Straps, Anti-Slip Mat, Storage Bag for Cars SUVs Travel](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [COSTWAY 15/21 Cubic Feet Car Roof Bag, 100% Waterproof Roofing Cargo Carrier with Anti-Slip Mat, Combination Lock & Straps, Rooftop Luggage Storage Box \(Black+Gray, 21 Cubic Ft/595L\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [Car Roof Bag 21 Cubic/595L,Waterproof Roof Box includes Anti-Slip Mat, 6 Heavy-Duty Straps & Storage Bag, Waterproof UV resistant for Cars, SUVs, Travel, Holidays](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)
- [Rymopuey Roof Bag, Waterproof Car Roof Bag No Rack Needed, Car Roof Box with Anti-Slip Mat and 8 Heavy-Duty Straps, Folding Soft Roof Box for Cars with/Without Rack \(Blue-20Cubic\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)

## Add-ons

- [URAQT Tie Down Straps, 4 Pack Heavy Duty Tensioning Belts, 4M Adjustable Cargo Straps Ratchet Straps for Motorcycle, Cargo, Trucks, Trailer, Luggage, 250kg Loading Capacity, Quick Release \(Black\)](https://bargainpostbox.co.uk/visit/costway-15-cu-ft-pvc-car-roof-bag)

## Images

![COSTWAY 15 cu ft PVC Car Roof Bag — 1](https://bargainpostbox.co.uk/i/x26ZSYlerVNx7natDtgVNPdGYfUWF4TWyKxuHaTrFtFHdLQtjlFEmB98gUtIull197g3BE64pKOGURWQFiqDiPF_0pYb5wMFdjlugyzSdSiKwAeKHjQXtSQ7.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 2](https://bargainpostbox.co.uk/i/_Ci5mgofxfVY-0wtNvGJsoeNzIT1OfNRxmqvq3nQfhPqEUPBYVn1RNidSLz6oqbjUxji01MSIcvXaR-OcZjC5Pw89a4QW4aKWHKlPJRPJCLOdWo_DLWCo9QA.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 3](https://bargainpostbox.co.uk/i/b6DSr0bib1GOVCKiA63jTSXevSqxx2JelkRzlBVYHp8N9AnTTsaMwV3Or3S5yL9UWYUn4fAk7gTbEAHXVed8XP3-HWK4_iDF2ungwmdY_18mNkhzXH94b4xk.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 4](https://bargainpostbox.co.uk/i/055UNVUGSbbgnmxRbzrMQUgon0_MqvL1_1v5AYlupqo-F79NbdElqrDoHaXdkueZcXCHXlaQlWlNVpoE1705bapa1bCxyM_-I_L4cPQfMDwzZnKC6kReIP52.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 5](https://bargainpostbox.co.uk/i/6FL-4AZS8LpxRAlgiXnZBxLbYFFg0nFoD-mToVF6AtrKCPxDeusDiB9Obt2mbzpoJgdAf8DjrdS8frByOIUXL2MzsjwOUsatKSld6xrDDDgv6ELGGFIa83vh.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 6](https://bargainpostbox.co.uk/i/XOiENp__UaIe83ekwa2nVF9UjkwL1r67k33_nwH_o23Sx2a9pZBnwgcson6XUGuTGOb-2luj31BWWeeX1pMgMt-5lejtVlLIes_I-uXtcZ6RJ0Vb8WQkBAO3.jpg)

![COSTWAY 15 cu ft PVC Car Roof Bag — 7](https://bargainpostbox.co.uk/i/_9B3rHhKgXT3Up4FsU4O0VGalszIWdkq9gMuZ1jQMuQFvo_XkwykfE3QC698WoVPWr1a05b1DRI-UFqysi35IKmAIjDTbls1navj9Nzrhhf7lIPUeE0GgPyF.jpg)