Volvo's Inflatable Child Seat Concept is shown on the Volvo YouTube channel. (Volvo Cars/YouTube)

Swedish car company Volvo says it is working on an inflatable child car seat that weighs less than 11 pounds and can fit neatly in a backpack.

It's still in the conceptual stage, but the car seat would inflate in 40 seconds with an internal pump. The secret is a strong fabric that was developed as part of the military's aborted attempts to make inflatable airplanes, the company says.

Volvo has not announced plans yet to bring the car seat to market.