However, there is no such beast as a “low pressure air pocket”, nor was the turbulence you experienced the fault of the relatively small size of the aircraft.

What your flight experienced was Windshear — an abrupt change in wind velocity and/or direction. Any aircraft in flight has momentum, and when the airmass through which it is flying is “squirrelly” (due to thunderstorms or cold fronts, for example), the aircraft can abruptly gain or lose airspeed and/or altitude. The aircraft keeps going (momentum), while the air shifts around it (windshear), and the result is “turbulence”.

We humans are particularly sensitive to the sensation of dropping (more so than to the sensation of rising, for some reason), and indeed the sudden loss of altitude can feel like falling into an empty “pocket” devoid of air. In our Earth’s atmosphere, however, an empty air pocket is not physically possible.

There is no pocket, no emptiness — only a very temporary reduction in lift. The momentum of the aircraft will carry through and the lift over the wings will be fully restored within seconds. Aircraft are designed to be inherently stable and self-recovering from turbulence. We might have a bumpy ride, but the aircraft will stay right-side-up and aloft.