Last month, undercover agents with the U.S. Department of Homeland Security smuggled mock explosives and banned weapons past airport security checkpoints 67 out of 70 times. Now, scientists have found a new way to protect passengers—not by beefing up airport security, but by protecting the plane itself, NBC News reports. Researchers say they have created the Fly-Bag, which lines an aircraft’s luggage hold with multiple layers of bomb-proof fabrics. They conducted tests on a Boeing 787 and an Airbus 321, detonating and successfully containing bombs akin to the ones in the 1988 Lockerbie bombing. The team says the bag acts as a membrane rather than a rigid-walled container, increasing its resilience against explosions. Such devices could be adapted for use in the airplane cabin as well, the scientists say.