What are the three most important aspects of packing the main canopy?

The correct choice highlights three crucial aspects that ensure the main parachute functions correctly during deployment. Having the lines straight and in place is essential because it prevents line twists that can lead to malfunctions upon opening. When the lines are organized properly, it allows for a clean, straight deployment of the canopy, which is vital for stability and control during freefall and especially during the opening sequence.

The recommendation to keep the slider up is significant because it allows the parachute to open fully and smoothly. The slider serves to control the opening characteristics of the canopy, and when it is positioned correctly, it helps in gradually slowing down the opening shock and reducing the risk of damage to the parachute.

Tight line stows are also critical as they ensure that the lines do not snag or hang up during deployment, which could result in a dangerous situation. Properly stowing the lines keeps everything neat and organized, further supporting a safe and efficient deployment.

Ensuring these three aspects are adhered to during packing boosts the overall safety and reliability of the parachute system.