Which shape of a low-pressure rescue lift airbag offers the greatest stability?

• A. Rectangular
• B. Square
• C. Circular
• D. Triangular

Answer: (B)

Stability in low-pressure rescue lift airbags comes from how the base contacts the load and the ground and how well the shape resists tipping when the load shifts. A square shape provides a balanced, symmetric footprint with flat sides that distribute pressure evenly and help keep the bag aligned with the load. This symmetry makes it harder for the bag to tilt or roll if the load isn’t perfectly centered, giving you a more predictable lift.

Compared to a circular bag, which can roll if the load shifts because there are no edges to restrain movement, a square bag offers better resistance to lateral tipping. A triangular shape has a limited base and tends to tip more easily, and a rectangular one can become unstable if the load is off-center along a long edge. So the square’s combination of flat sides and corners gives the greatest stability for lifting.