1. Effectively expands the top box, precisely tailored to perfectly align with the recesses of the top box lid
2. Securely fastens to the top box lids mounting rings via four straps
3. Waterproof and dustproof with non-slip handles for easy installation
4. Large capacity with smooth zipper closure for enhanced usability
5. Material: nylon (with internal waterproof coating)
6. Size: about 30 x 24 x 9cm
7. Weight: about 550g