Update: Deal over.

Keeper Waterproof Roof Top Cargo Bag – Link

Amazon has this currently marked down to $32.96 w/ free shipping.

This normally sells for $50-$55 and is now its lowest ever on Amazon.

• Waterproof rooftop cargo bag with 15 cubic feet of space ; Fits all roof racks
• Increases vehicle cargo space. Designed to fit all roof racks with attachment capabilities on all four sides, if less than four, caution needs to be taken for secure attachment.
• Waterproof design protects cargo against road grit, sun, wind and rain.
• Soft sides flex to fit odd-shaped loads. Heavy duty construction
• Folds compact for easy storage. Overall size is 44” x 34” x 17”.
• Made of rubber laminated nylon